Update actions/checkout digest to a5ac7e5

Author: renovate[bot]

.github/workflows/dart.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+      - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4
 
       - uses: dart-lang/setup-dart@7f54cd0cee53e120db0d1fce4196b7772ebd6f6e
         with: