CI: Fix some issues pointed out by zizmor (ansible-collections#9250)

Fix some issues pointed out by zizmor.

Author: felixfontein

.github/workflows/codeql-analysis.yml

@@ -25,6 +25,8 @@ jobs:
     steps:
     - name: Checkout repository
       uses: actions/checkout@v4
+      with:
+        persist-credentials: false
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/reuse.yml

@@ -28,6 +28,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
         with:
+          persist-credentials: false
           ref: ${{ github.event.pull_request.head.sha || '' }}
 
       - name: REUSE Compliance Check