Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Setup Java
         uses: actions/setup-java@c1e323688fd81a25caa38c78aa6df2d33d3e20d9 # v4

.github/workflows/release.yml

@@ -24,7 +24,7 @@ jobs:
           private-key: ${{ secrets.RELEASE_APP_PRIVATE_KEY }}
 
       - name: Checkout repository
-        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 0
           token: ${{ steps.app-token.outputs.token }}