fix(deps): update polkadot-js/api, and rxjs

[TarikGul]

Updates deps to the following:

"@polkadot/api": "^7.6.1",
"rxjs": "^7.5.2",

[TarikGul]

This introduces a warning every time a new runtime is queried but wont appear again once its cached:

2022-01-31 23:12:45 warn: ABLEREGISTRY: Unable to determine runtime Call type, cannot inspect sp_runtime::generic::unchecked_extrinsic::UncheckedExtrinsic
2022-01-31 23:12:45 warn: ABLEREGISTRY: Unable to determine runtime Event type, cannot inspect frame_system::EventRecord

Introduced via: polkadot-js/api@a650ae1

[niklasad1]

This introduces a warning every time a new runtime is queried but wont appear again once its cached:

Have you filed an issue upstream? However, it's just a warn shouldn't be a big deal I suppose.

[TarikGul]

This introduces a warning every time a new runtime is queried but wont appear again once its cached:

Have you filed an issue upstream? However, it's just a warn shouldn't be a big deal I suppose.

So I believe this is already known, as it's checking parachains metadata which explains why it only warns for relay chains. But that being said, it should be logging PORTABLEREGISTRY instead of ABLEREGISTRY which i'll report.

[TarikGul]

The warning's are still going to be there, but after doing some extensive testing, and reading the code, this is a non issue so I am merging. I will follow up in polkadot-js api as well.