Update actions/checkout digest to 8ade135 (#18)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
         os: [macos-10.15, macos-11, macos-12]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
+      - uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 # v4
       - name: Install dependencies
         run: |
           python3 --version