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	0.97s
✅ MARKDOWN	markdownlint	7	0	0	0	1.38s
✅ PYTHON	ruff	960	0	0	0	1.01s
✅ PYTHON	ruff-format	960	0	0	0	0.36s
✅ YAML	prettier	15	0	0	0	1.58s
✅ YAML	v8r	15		0	0	5.47s
✅ YAML	yamllint	15		0	0	0.72s

See detailed reports in MegaLinter artifacts

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop-v12.0.0@86834fa). 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                   ?   81.72%           
==================================================
  Files                      ?      209           
  Lines                      ?    24360           
  Branches                   ?     3865           
==================================================
  Hits                       ?    19908           
  Misses                     ?     3141           
  Partials                   ?     1311           

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