chore(deps): update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/code-quality.yml

@@ -236,7 +236,7 @@ jobs:
         uses: Swatinem/rust-cache@v2
 
       - name: Setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.x'
 

.github/workflows/l10n.yml

@@ -80,7 +80,7 @@ jobs:
       with:
         persist-credentials: false
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.x'
     - name: Install Mozilla Fluent Linter