Updates supporting release 23.3.0

[claws]

This merge request captures a number of changes that prepare the repo for the next release. The changes are:

• Update docs to demonstrate how to use basic authentication with Pusher.
• Developer updates
  • CI is not working in master due to various package updates that change behaviour.
  • Removed isort optional extra 'deprecated_imports_finder' as it isn't supported anymore.
  • Minor type annotations updates to keep mypy happy
  • Updated '.pylintrc' to fix warnings about options that are no longer supported.
  • Updated Sphinx config to specify language to avoid warning being reported.
  • Minor updates to address pylint warnings
  • Silence orjson no-members warnings (See: https://github.com/ijl/orjson/issues/248)
  • Added httpx as developmental dependency so that the Starlette test client can be used again.
  • Update ASGI middleware to obtain starlette app reference from 'http' ASGI scope when run from Starlette test client.
  • Updated Pusher unit test to check basic authentication works.
  • Added aiohttp_basicauth to dev dependencies to support this.
  • Fix CI
  • Removed support for Python3.6 as it isn't supported by Github actions anymore.
    • Updated repo to indicate minimum supported Python is 3.8+
  • Removed dependency on asynctest package which is no longer maintained and causes errors in Python3.11.
    • Using unittest.IsolatedAsyncioTestCase instead, but this is only available for Python 3.8+.
  • Updated CI workflow 'uses' items to use later versions
• Removed support for Prometheus binary protocol (fixes #57). Prometheus 2.0 removed support for the binary protocol.
  • Updated unit tests
  • Updated CI
  • Updated docs
  • Updated examples
• Updated CHANGELOG.md

[codecov-commenter]

Codecov Report

Merging #87 (79d0bb7) into master (4220a99) will increase coverage by 0.44%. The diff coverage is 93.02%.

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@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   95.51%   95.96%   +0.44%     
==========================================
  Files          17       16       -1     
  Lines         780      718      -62     
  Branches      114       93      -21     
==========================================
- Hits          745      689      -56     
+ Misses         19       15       -4     
+ Partials       16       14       -2     

Impacted Files	Coverage Δ
src/aioprometheus/formats/__init__.py	100.00% <ø> (+40.00%)	:arrow_up:
src/aioprometheus/formats/text.py	97.11% <ø> (ø)
src/aioprometheus/negotiator.py	100.00% <ø> (+4.76%)	:arrow_up:
src/aioprometheus/asgi/middleware.py	90.27% <88.46%> (+1.70%)	:arrow_up:
src/aioprometheus/__init__.py	100.00% <100.00%> (ø)
src/aioprometheus/collectors.py	97.77% <100.00%> (ø)
src/aioprometheus/decorators.py	96.20% <100.00%> (ø)
src/aioprometheus/metricdict.py	100.00% <100.00%> (ø)
src/aioprometheus/pusher.py	95.65% <100.00%> (+0.09%)	:arrow_up:
src/aioprometheus/service.py	89.02% <100.00%> (ø)

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