chore(deps): update actions/checkout digest to b4ffde6

Signed-off-by: Renovate Bot <bot@renovateapp.com>

.github/workflows/build-documentation.yml

@@ -20,7 +20,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       - uses: actions/setup-python@v4
         with:
           python-version: '3.x'