ci: switch to matrix subaction

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

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
         uses: actions/checkout@v6
       -
         name: Test
-        uses: docker/bake-action@v6
+        uses: docker/bake-action@v7
         with:
           source: .
           targets: test

.github/workflows/update-dist.yml

@@ -28,7 +28,7 @@ jobs:
           token: ${{ steps.docker-read-app.outputs.token || github.token }}
       -
         name: Build
-        uses: docker/bake-action@v6
+        uses: docker/bake-action@v7
         with:
           source: .
           targets: build

.github/workflows/validate.yml

@@ -15,15 +15,15 @@ jobs:
   prepare:
     runs-on: ubuntu-latest
     outputs:
-      targets: ${{ steps.generate.outputs.targets }}
+      matrix: ${{ steps.generate.outputs.matrix }}
     steps:
       -
         name: Checkout
         uses: actions/checkout@v6
       -
-        name: List targets
+        name: Generate matrix
         id: generate
-        uses: docker/bake-action/subaction/list-targets@v6
+        uses: docker/bake-action/subaction/matrix@v7
         with:
           target: validate
 
@@ -34,10 +34,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        target: ${{ fromJson(needs.prepare.outputs.targets) }}
+        include: ${{ fromJson(needs.prepare.outputs.matrix) }}
     steps:
       -
         name: Validate
-        uses: docker/bake-action@v6
+        uses: docker/bake-action@v7
         with:
           targets: ${{ matrix.target }}