ci: update bake-action to v6

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

.github/workflows/validate.yml

@@ -94,9 +94,6 @@ jobs:
           if [ "$GITHUB_REPOSITORY" = "docker/buildx" ]; then
             echo "GOLANGCI_LINT_MULTIPLATFORM=1" >> $GITHUB_ENV
           fi
-      -
-        name: Checkout
-        uses: actions/checkout@v4
       -
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -106,7 +103,7 @@ jobs:
           buildkitd-flags: --debug
       -
         name: Validate
-        uses: docker/bake-action@v5
+        uses: docker/bake-action@v6
         with:
           targets: ${{ matrix.target }}
           set: |