CI: auto-fix via zizmor

May include:

- Avoids risky string interpolation.
- Prevents checkout premissions from leaking

Author: tacaswell

.github/workflows/build.yml

@@ -12,6 +12,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
+      with:
+        persist-credentials: false
     - uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}