Remove support for Python 3.9 (EOL 2025-10-31)

Author: jschlyter

.github/workflows/test.yml

@@ -23,7 +23,6 @@ jobs:
     strategy:
       matrix:
         python-version:
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"

pyproject.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 packages = [
     { include = "cryptojwt", from = "src" }
 ]
-requires-python = ">=3.9,<4.0"
+requires-python = ">=3.10,<4.0"
 dependencies = [
     "cryptography>=3.4.6",
     "requests>=2.25.1"