Update GitHub Actions workflows to use updated action versions

- Updated actions/checkout to v5.0.0
- Updated actions/setup-python to v6.0.0
- Updated docker/build-push-action to v6.18.0
- Updated actions/upload-artifact to v4.6.2
- Updated actions/download-artifact to v5.0.0
- Updated sigstore/gh-action-sigstore-python to v3.0.1

.github/workflows/docker.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8  # v5.0.0
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@29109295f81e9208d7d86ff1c6c12d2833863392
@@ -51,7 +51,7 @@ jobs:
             type=sha,format=short
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83  # v6.18.0
         with:
           context: .
           platforms: linux/amd64,linux/arm64
@@ -74,7 +74,7 @@ jobs:
             type=sha,format=short,suffix=-rootless
 
       - name: Build and push rootless Docker image
-        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83  # v6.18.0
         with:
           context: .
           file: ./Dockerfile.rootless