Drop Python 3.9 support

.github/ISSUE_TEMPLATE/bug_report.yaml

@@ -10,7 +10,7 @@ body:
 
         Before filing a bug, please be sure you have searched through [existing bugs](https://github.com/open-telemetry/opentelemetry-python/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3Abug) to see if your bug is already addressed.
         If your bug is related to an instrumentation or plugin in [opentelemetry-python-contrib](https://github.com/open-telemetry/opentelemetry-python-contrib) please be sure to file it there.
-  
+
   - type: textarea
     id: environment
     attributes:
@@ -19,10 +19,10 @@ 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 3.9.10)
+        Python version: (e.g., Python 3.10.0)
         SDK version: (e.g., 1.25.0)
         API version: (e.g., 1.25.0)
-  
+
   - type: textarea
     attributes:
       label: What happened?

.github/workflows/generate_workflows.py

@@ -14,7 +14,7 @@
 )
 _tox_lint_env_regex = re_compile(r"lint-(?P<name>[-\w]+)")
 _tox_contrib_env_regex = re_compile(
-    r"py39-test-(?P<name>[-\w]+\w)-?(?P<contrib_requirements>\d+)?"
+    r"py310-test-(?P<name>[-\w]+\w)-?(?P<contrib_requirements>\d+)?"
 )
 
 
@@ -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-3.9",
-        "py39": "3.9",
+        "pypy3": "pypy-3.10",
         "py310": "3.10",
         "py311": "3.11",
         "py312": "3.12",

.github/workflows/release.yml

@@ -74,7 +74,7 @@ jobs:
         # next few steps publish to pypi
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.10'
 
       - name: Build wheels
         run: ./scripts/build.sh