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

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@b4ffde65f46336ab88eb53be808477a3936bae11 # 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@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
 
     - name: Install Protoc
       uses: arduino/setup-protoc@v2