build: Drop Python 3.9 support

which EOLed on 17th of May 2022 and does not receive security support since
31st October 2025 anymore.

Signed-off-by: Burfeind, Jan-Niklas <jan-niklas.burfeind@sennheiser.com>

Author: AiyionPrime

.github/workflows/push-pr-unit-tests.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
     uses: ./.github/workflows/reusable-unit-tests.yml
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

.github/workflows/scheduled-unit-tests.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
+        python-version: ['3.10', '3.11', '3.12', '3.13', '3.14']
         branch: ['master']
     uses: ./.github/workflows/reusable-unit-tests.yml
     secrets:

pyproject.toml

@@ -16,15 +16,14 @@ authors = [
 description = "embedded systems control library for development, testing and installation"
 readme = "README.rst"
 license = { file="LICENSE" }
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 classifiers = [
     "Intended Audience :: Developers",
     "Development Status :: 5 - Production/Stable",
     "Operating System :: POSIX :: Linux",
     "Topic :: Software Development :: Testing",
     "Framework :: Pytest",
     "Programming Language :: Python :: 3 :: Only",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",