Bump Python version from py3.8 to py3.9

[FlorentClarret]

What does this PR do?

Bump python version from py3.8 to py3.9

Motivation

DataDog/datadog-agent#17501

Additional Notes

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have changelog/ and integration/ labels attached
• If the PR doesn't need to be tested during QA, please add a qa/skip-qa label.

[codecov]

Codecov Report

Merging #14701 (c65072a) into master (8f1cf6e) will decrease coverage by 0.28%.
The diff coverage is n/a.

Flag	Coverage Δ
active_directory	100.00% <ø> (+17.64%)	⬆️
activemq_xml	82.31% <ø> (ø)
arangodb	98.23% <ø> (ø)
argocd	88.43% <ø> (ø)
aspdotnet	100.00% <ø> (+26.19%)	⬆️
avi_vantage	92.54% <ø> (ø)
azure_iot_edge	82.08% <ø> (ø)
boundary	100.00% <ø> (ø)
btrfs	82.91% <ø> (ø)
calico	83.54% <ø> (ø)
citrix_hypervisor	87.50% <ø> (ø)
cloud_foundry_api	96.35% <ø> (+0.48%)	⬆️
cloudera	99.82% <ø> (ø)
cockroachdb	91.90% <ø> (ø)
consul	91.65% <ø> (ø)
couch	95.43% <ø> (+0.48%)	⬆️
crio	89.79% <ø> (ø)
datadog_checks_base	89.59% <ø> (+0.35%)	⬆️
datadog_checks_dev	82.80% <ø> (+0.12%)	⬆️
datadog_checks_downloader	81.65% <ø> (ø)
ddev	99.05% <ø> (-0.15%)	⬇️
disk	89.19% <ø> (-2.14%)	⬇️
dns_check	93.90% <ø> (ø)
eks_fargate	94.05% <ø> (ø)
envoy	95.02% <ø> (+0.42%)	⬆️
etcd	95.56% <ø> (ø)
fluentd	94.77% <ø> (ø)
harbor	80.04% <ø> (ø)
ibm_ace	91.79% <ø> (ø)
ibm_db2	95.30% <ø> (+0.19%)	⬆️
ibm_i	81.95% <ø> (ø)
ibm_mq	91.26% <ø> (-0.14%)	⬇️
impala	97.97% <ø> (ø)
istio	77.43% <ø> (+0.55%)	⬆️
kube_apiserver_metrics	98.10% <ø> (ø)
kube_controller_manager	96.00% <ø> (ø)
kube_dns	95.97% <ø> (ø)
kube_scheduler	96.53% <ø> (ø)
kubelet	90.90% <ø> (+0.09%)	⬆️
linkerd	85.14% <ø> (+1.14%)	⬆️
mcache	93.50% <ø> (ø)
mesos_master	89.75% <ø> (ø)
mongo	96.55% <ø> (ø)
network	63.19% <ø> (-29.71%)	⬇️
nfsstat	95.20% <ø> (ø)
nginx_ingress_controller	98.36% <ø> (ø)
openmetrics	98.08% <ø> (ø)
openstack_controller	91.12% <ø> (ø)
process	85.42% <ø> (+0.28%)	⬆️
proxysql	98.97% <ø> (ø)
pulsar	100.00% <ø> (ø)
redisdb	87.89% <ø> (ø)
rethinkdb	97.93% <ø> (ø)
riakcs	93.61% <ø> (ø)
singlestore	90.81% <ø> (ø)
squid	100.00% <ø> (ø)
ssh_check	91.58% <ø> (ø)
supervisord	92.69% <ø> (+0.38%)	⬆️
traffic_server	96.13% <ø> (ø)
varnish	84.39% <ø> (+0.26%)	⬆️
vertica	98.50% <ø> (ø)
vsphere	90.11% <ø> (+0.08%)	⬆️
win32_event_log	86.40% <ø> (+0.41%)	⬆️
windows_performance_counters	98.36% <ø> (ø)
wmi_check	92.91% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[github-actions]

Test Results

     973 files       973 suites   6h 51m 36s ⏱️
  5 420 tests   5 344 ✔️      73 💤 1 ❌ 2 🔥
22 849 runs  19 200 ✔️ 3 646 💤 1 ❌ 2 🔥

For more details on these failures and errors, see this check.

Results for commit e123cfe.

♻️ This comment has been updated with latest results.

[AlexandreYang]

lgtm for snmp integration

[L3n41c]

👍🏻 LGTM for @DataDog/container-integrations owned files.