Address deprecation warnings and fix websockets in asgi

[claws]

• fixed aiohttp deprecation warnings. Affected files:

  • src/aioprometheus/service.py
  • tests/test_aiohttp.py

• fix pylint warnings. Affected files:

  • examples/service/app-service-example.py
  • examples/decorators/decorator_count_exceptions.py
  • examples/decorators/decorator_inprogress.py
  • examples/decorators/decorator_timer.py
  • src/aioprometheus/mypy_types.py
  • src/aioprometheus/collectors.py
  • src/aioprometheus/renderer.py
  • src/aioprometheus/asgi/middleware.py

• incorporates #94 (fixes #93) which supports websockets in asgi frameworks. Affected files:

  • src/aioprometheus/service.py

• bump version to 23.12.0

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (4786678) 95.96% compared to head (1e3aef2) 95.96%.

Files	Patch %	Lines
src/aioprometheus/asgi/middleware.py	75.00%	0 Missing and 1 partial :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #97 +/- ## ======================================= Coverage 95.96% 95.96% ======================================= Files 16 16 Lines 718 719 +1 Branches 93 93 ======================================= + Hits 689 690 +1 Misses 15 15 Partials 14 14 ```

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