chore(deps): update actions/checkout action to v6.0.3

Author: renovate[bot]

.github/workflows/java-version-matrix-tests.yml

@@ -26,7 +26,7 @@ jobs:
         java-version: [8, 11, 17, 21, 25]
     steps:
       - name: Check out
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
 

.github/workflows/lint.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
           fetch-depth: 0 # needed for git diff --merge-base in lint:links

.github/workflows/nightly-benchmarks.yml

@@ -28,7 +28,7 @@ jobs:
       contents: read # checkout only
     steps:
       - name: Checkout main branch
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
           fetch-depth: 0
@@ -75,7 +75,7 @@ jobs:
       contents: write # push generated results to the benchmarks branch
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           # zizmor: ignore[artipacked] -- needs credentials to push to benchmarks branch
           persist-credentials: true