ci: drop Python 3.10 from the compatibility matrix

The project's dev group pins sphinx>=8.2, which requires Python >=3.11, so
requires-python is >=3.11,<4.0 and the package cannot resolve or install on
3.10. Testing 3.10 in the compatibility matrix therefore fails permanently.
Align the matrix with requires-python by testing 3.11, 3.12, and 3.13 only.

https://claude.ai/code/session_01SZ6zUJ8Abtzn2cJC76XHmm

Author: claude

.github/workflows/python-compatibility.yml

@@ -37,7 +37,9 @@ jobs:
     name: Python Compatibility Matrix
     uses: ByronWilliamsCPA/.github/.github/workflows/python-compatibility.yml@c22009ccaab0d3234819d30d9d7a03d53c531cb9  # main
     with:
-      python-versions: '["3.10", "3.11", "3.12", "3.13"]'
+      # Project requires Python >=3.11 (sphinx>=8.2 in the dev group drops 3.10),
+      # so 3.10 is intentionally excluded to match requires-python in pyproject.toml.
+      python-versions: '["3.11", "3.12", "3.13"]'
       operating-systems: '["ubuntu-latest"]'
       include-macos: true
       include-windows: true