Remove Python 3.8 Support

[TimPansino]

Overview

• Drop support for Python 3.8.
• Remove all code paths for Python 3.8 and below.
• Run linters/formatters to upgrade syntax where appropriate.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	7		0	0	0.9s
✅ MARKDOWN	markdownlint	7	0	0	0	1.41s
✅ PYTHON	ruff	960	0	0	0	1.14s
✅ PYTHON	ruff-format	960	0	0	0	0.33s
✅ YAML	prettier	15	0	0	0	1.52s
✅ YAML	v8r	15		0	0	5.84s
✅ YAML	yamllint	15		0	0	0.71s

See detailed reports in MegaLinter artifacts

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop-v12.0.0@1be4da1). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
newrelic/common/package_version_utils.py	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##             develop-v12.0.0    #1611   +/-   ##
==================================================
  Coverage                   ?   81.73%           
==================================================
  Files                      ?      209           
  Lines                      ?    24354           
  Branches                   ?     3862           
==================================================
  Hits                       ?    19905           
  Misses                     ?     3138           
  Partials                   ?     1311           

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[umaannamalai]

I was double checking the repo for references to Python 3.8 and noticed this function in newrelic/core/environment.py which could be updated to cover multiple version removals we've already done as well as 3.8:

def _get_stdlib_builtin_module_names():
    builtins = set(sys.builtin_module_names)
    # Since sys.stdlib_module_names is not available in versions of python below 3.10,
    # use isort's hardcoded stdlibs instead.
    python_version = sys.version_info[0:2]
    if python_version < (3,):
        stdlibs = isort_stdlibs.py27.stdlib
    elif (3, 7) <= python_version < (3, 8):
        stdlibs = isort_stdlibs.py37.stdlib
    elif python_version < (3, 9):
        stdlibs = isort_stdlibs.py38.stdlib
    elif python_version < (3, 10):
        stdlibs = isort_stdlibs.py39.stdlib
    elif python_version >= (3, 10):
        stdlibs = sys.stdlib_module_names
    else:
        _logger.warning("Unsupported Python version. Unable to determine stdlibs.")
        return builtins
    return builtins | stdlibs

We could also update this comment in pyproject.toml:

"UP006", # non-pep585-annotation (not compatible with Python 3.8)