CI: Run lint checks once

Avoid repeating version-independent lockfile and lint checks across the Python matrix.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: kevinjqliu

.github/workflows/python-ci.yml

@@ -57,10 +57,12 @@ jobs:
     - name: Install system dependencies
       run: sudo apt-get update && sudo apt-get install -y libkrb5-dev # for kerberos
     - name: Check uv.lock is up to date
+      if: matrix.python == '3.12'
       run: uv lock --check
     - name: Install
       run: make install
     - name: Run linters
+      if: matrix.python == '3.12'
       run: make lint
     - name: Run unit tests with coverage
       run: COVERAGE=1 make test