Update actions/checkout digest to a5ac7e5

Generated by renovateBot

Author: renovate[bot]

.github/workflows/buildtest.yaml

@@ -25,7 +25,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
+      - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4
       - uses: actions/cache@v4
         with:
           path: |

.github/workflows/generate.yaml

@@ -23,7 +23,7 @@ jobs:
   generate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
+      - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4
 
       - name: Install Protoc
         uses: arduino/setup-protoc@v2