Update GitHub Action workflows to actions/checkout@v6 (8.5)

Author: TimWolla

.github/workflows/real-time-benchmark.yml

@@ -118,21 +118,21 @@ jobs:
           sudo apt-get update -y
           sudo apt-get install -y terraform=1.5.7-*
       - name: Checkout benchmark suite
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: 'kocsismate/php-version-benchmarks'
           ref: 'main'
           fetch-depth: 1
           path: 'php-version-benchmarks'
       - name: Checkout php-src (benchmarked version)
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: '${{ env.REPOSITORY }}'
           ref: '${{ env.COMMIT }}'
           fetch-depth: 100
           path: 'php-version-benchmarks/tmp/php_${{ env.ID }}'
       - name: Checkout php-src (baseline version)
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: '${{ env.REPOSITORY }}'
           ref: '${{ env.BASELINE_COMMIT }}'
@@ -146,7 +146,7 @@ jobs:
           rm -rf ./php-version-benchmarks/docs/results
       - name: Checkout benchmark data
         if: github.event_name != 'workflow_dispatch'
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: php/real-time-benchmark-data
           ssh-key: ${{ secrets.PHP_VERSION_BENCHMARK_RESULTS_DEPLOY_KEY }}