Update monolog/monolog requirement from ^2.0 to ^2.1

[dependabot-preview]

Updates the requirements on monolog/monolog to permit the latest version.

Release notes

Sourced from monolog/monolog's releases.

2.1.0

• Added JSON_INVALID_UTF8_SUBSTITUTE to default json flags, so that invalid UTF8 characters now get converted to � instead of being converted from ISO-8859-15 to UTF8 as it was before, which was hardly a comprehensive solution
• Added $ignoreEmptyContextAndExtra option to JsonFormatter to skip empty context/extra entirely from the output
• Added $parseMode, $disableWebPagePreview and $disableNotification options to TelegramBotHandler
• Added tentative support for PHP 8
• NormalizerFormatter::addJsonEncodeOption and removeJsonEncodeOption are now public to allow modifying default json flags
• Fixed GitProcessor type error when there is no git repo present
• Fixed normalization of SoapFault objects containing deeply nested objects as "detail"
• Fixed support for relative paths in RotatingFileHandler

Changelog

Sourced from monolog/monolog's changelog.

2.1.0 (2020-05-22)

• Added JSON_INVALID_UTF8_SUBSTITUTE to default json flags, so that invalid UTF8 characters now get converted to � instead of being converted from ISO-8859-15 to UTF8 as it was before, which was hardly a comprehensive solution
• Added $ignoreEmptyContextAndExtra option to JsonFormatter to skip empty context/extra entirely from the output
• Added $parseMode, $disableWebPagePreview and $disableNotification options to TelegramBotHandler
• Added tentative support for PHP 8
• NormalizerFormatter::addJsonEncodeOption and removeJsonEncodeOption are now public to allow modifying default json flags
• Fixed GitProcessor type error when there is no git repo present
• Fixed normalization of SoapFault objects containing deeply nested objects as "detail"
• Fixed support for relative paths in RotatingFileHandler

2.0.2 (2019-12-20)

• Fixed ElasticsearchHandler swallowing exceptions details when failing to index log records
• Fixed normalization of SoapFault objects containing non-strings as "detail" in LineFormatter
• Fixed formatting of resources in JsonFormatter
• Fixed RedisHandler failing to use MULTI properly when passed a proxied Redis instance (e.g. in Symfony with lazy services)
• Fixed FilterHandler triggering a notice when handleBatch was filtering all records passed to it
• Fixed Turkish locale messing up the conversion of level names to their constant values

2.0.1 (2019-11-13)

• Fixed normalization of Traversables to avoid traversing them as not all of them are rewindable
• Fixed setFormatter/getFormatter to forward to the nested handler in FilterHandler, FingersCrossedHandler, BufferHandler, OverflowHandler and SamplingHandler
• Fixed BrowserConsoleHandler formatting when using multiple styles
• Fixed normalization of exception codes to be always integers even for PDOException which have them as numeric strings
• Fixed normalization of SoapFault objects containing non-strings as "detail"
• Fixed json encoding across all handlers to always attempt recovery of non-UTF-8 strings instead of failing the whole encoding
• Fixed ChromePHPHandler to avoid sending more data than latest Chrome versions allow in headers (4KB down from 256KB).
• Fixed type error in BrowserConsoleHandler when the context array of log records was not associative.

2.0.0 (2019-08-30)

• BC Break: This is a major release, see https://github.com/Seldaek/monolog/blob/master/UPGRADE.md for details if you are coming from a 1.x release
• BC Break: Logger methods log/debug/info/notice/warning/error/critical/alert/emergency now have explicit void return types
• Added FallbackGroupHandler which works like the WhatFailureGroupHandler but stops dispatching log records as soon as one handler accepted it
• Fixed support for UTF-8 when cutting strings to avoid cutting a multibyte-character in half
• Fixed normalizers handling of exception backtraces to avoid serializing arguments in some cases
• Fixed date timezone handling in SyslogUdpHandler

2.0.0-beta2 (2019-07-06)

• BC Break: This is a major release, see https://github.com/Seldaek/monolog/blob/master/UPGRADE.md for details if you are coming from a 1.x release
• BC Break: PHP 7.2 is now the minimum required PHP version.
• BC Break: Removed SlackbotHandler, RavenHandler and HipChatHandler, see https://github.com/Seldaek/monolog/blob/master/UPGRADE.md for details
• Added OverflowHandler which will only flush log records to its nested handler when reaching a certain amount of logs (i.e. only pass through when things go really bad)
• Added TelegramBotHandler to log records to a Telegram bot account
• Added support for JsonSerializable when normalizing exceptions
• Added support for RFC3164 (outdated BSD syslog protocol) to SyslogUdpHandler
• Added SoapFault details to formatted exceptions

... (truncated)

Commits

• 3891442 Remove allow_failures flag from php 8
• 977e91b Skip linting on php8
• ed3d51a Bump php requirement to allow greater releases
• ec855db Remove Composer platform check to allow php8 testing
• dc1e854 Update changelog
• a5327ca Merge branch '1.x'
• 3022eff Update changelog
• b5260af Also remove deprecation warnings when running outside of travis on php 7.4
• 6f9b0a5 Remove deprecation warnings on 7.4
• a73b403 Build updates
• Additional commits viewable in compare view

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