ci: update docker/build-and-push action v5 -> v6

Author: ryboe

.github/workflows/pr.yml

@@ -17,7 +17,7 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ github.token }}
       - name: Build image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           cache-from: type=gha
           platforms: linux/amd64 # GitHub only offers AMD64 codespaces

.github/workflows/release.yml

@@ -3,7 +3,7 @@ name: Weekly Release
 # Build a fresh image every week.
 on:
   schedule:
-    - cron: '0 14 * * 1' # run at 9am eastern US time every Monday
+    - cron: 0 14 * * 1 # run at 9am eastern US time every Monday
   push:
     branches:
       - main
@@ -21,7 +21,7 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ github.token }}
       - name: Build and Push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64 # GitHub only offers AMD64 codespaces
           pull: true