Bump node from 24-slim to 25-slim

Bumps node from 24-slim to 25-slim.

---
updated-dependencies:
- dependency-name: node
  dependency-version: 25-slim
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -113,7 +113,7 @@ jobs:
 
       - id: build
         name: Build (and push by digest on master)
-        uses: docker/build-push-action@v7
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: ${{ matrix.platform }}

compose.yml

@@ -85,7 +85,7 @@ services:
 
   # Rebuilds the CSS/JS bundles into pipeline/built_assets whenever the sources change
   assets:
-    image: node:24-slim
+    image: node:25-slim
     working_dir: /app
     volumes:
       - .:/app