Chore: Drop support for Python 3.8

Python 3.8 was EoL @ 2024-10-07, our 6 month promise for support will end @ 2024-04-07.
This PR removes all unnecessary references and modifies the baseline references to 3.9.
Outdated python syntax was updated with pyupgrade.

Author: jomcgi

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -18,7 +18,7 @@ body:
         Please describe any aspect of your environment relevant to the problem, including your Python version, [platform](https://docs.python.org/3/library/platform.html), version numbers of installed dependencies, information about your cloud hosting provider, etc. If you're reporting a problem with a specific version of a library in this repo, please check whether the problem has been fixed on main.
       value: |
         OS: (e.g, Ubuntu)
-        Python version: (e.g., Python 3.8.10)
+        Python version: (e.g., Python 3.9.10)
         Package version: (e.g., 0.46.0)
   
   - type: textarea

.github/workflows/generate_workflows_lib/pyproject.toml

@@ -7,7 +7,7 @@ name = "generate-workflows-lib"
 dynamic = ["version"]
 description = "A library to generate workflows"
 license = "Apache-2.0"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 authors = [
   { name = "OpenTelemetry Authors", email = "[email protected]" },
 ]
@@ -17,7 +17,6 @@ classifiers = [
   "License :: OSI Approved :: Apache Software License",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",

.github/workflows/generate_workflows_lib/src/generate_workflows_lib/__init__.py

@@ -47,8 +47,7 @@ def get_test_job_datas(tox_envs: list, operating_systems: list) -> list:
     os_alias = {"ubuntu-latest": "Ubuntu", "windows-latest": "Windows"}
 
     python_version_alias = {
-        "pypy3": "pypy-3.8",
-        "py38": "3.8",
+        "pypy3": "pypy-3.9",
         "py39": "3.9",
         "py310": "3.10",
         "py311": "3.11",

.github/workflows/package-release.yml

@@ -78,7 +78,7 @@ jobs:
         # next few steps publish to pypi
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: '3.9'
 
       - name: Build wheels
         run: ./scripts/build_a_package.sh

.github/workflows/release.yml

@@ -66,7 +66,7 @@ jobs:
         # next few steps publish to pypi
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.8'
+          python-version: '3.9'
 
       - name: Build wheels
         run: ./scripts/build.sh