Bump docker/build-push-action from 2 to 5

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2 to 5.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v2...v5)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci.yaml

@@ -39,7 +39,7 @@ jobs:
         uses: actions/checkout@v4
       - name: Build Nidhugg
         id: build
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: false
@@ -61,7 +61,7 @@ jobs:
         uses: actions/checkout@v4
       - name: Build Nidhugg
         id: build
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: false
@@ -77,7 +77,7 @@ jobs:
         uses: actions/checkout@v4
       - name: Build Docker Image
         id: build
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: false
@@ -98,7 +98,7 @@ jobs:
         continue-on-error: true
       - name: Build Docker Image
         id: build
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v5
         with:
           context: .
           push: false