ci: bump the actions group with 2 updates

Bumps the actions group with 2 updates: [docker/build-push-action](https://github.com/docker/build-push-action) and [helm/kind-action](https://github.com/helm/kind-action).


Updates `docker/build-push-action` from 6.18.0 to 6.19.2
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@2634353...10e90e3)

Updates `helm/kind-action` from 1.13.0 to 1.14.0
- [Release notes](https://github.com/helm/kind-action/releases)
- [Commits](helm/kind-action@92086f6...ef37e7f)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: 6.19.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: helm/kind-action
  dependency-version: 1.14.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
...

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

Author: dependabot[bot]

.github/workflows/dockerfile-build.yaml

@@ -75,7 +75,7 @@ jobs:
 
       - name: Build and push Docker image
         id: build
-        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
+        uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6
         with:
           context: .
           platforms: ${{ matrix.platform }}

.github/workflows/dockerfile.yaml

@@ -41,7 +41,7 @@ jobs:
           echo "commit_sha=$COMMIT" >> $GITHUB_OUTPUT
 
       - name: Build
-        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
+        uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6
         with:
           context: .
           tags: zulip/zulip-server:pr-${{ github.event.pull_request.number }}
@@ -139,7 +139,7 @@ jobs:
           DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
 
       - name: Create kind cluster
-        uses: helm/kind-action@92086f6be054225fa813e0a4b13787fc9088faab # v1.13.0
+        uses: helm/kind-action@ef37e7f390d99f746eb8b610417061a60e82a6cc # v1.14.0
 
       - name: Download image
         uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0