chore(deps): bump docker/login-action from 3 to 4

Bumps [docker/login-action](https://github.com/docker/login-action) from 3 to 4.
- [Release notes](https://github.com/docker/login-action/releases)
- [Commits](docker/login-action@v3...v4)

---
updated-dependencies:
- dependency-name: docker/login-action
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build-keycloak-image.yml

@@ -30,7 +30,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Log in to Docker Hub (or GHCR)
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: openstack-experimental

.github/workflows/build-keystone-py-image.yml

@@ -50,7 +50,7 @@ jobs:
             py-27.0.0
 
       - name: Login to Docker Hub
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: openstack-experimental
@@ -100,7 +100,7 @@ jobs:
           merge-multiple: true
 
       - name: Login to Docker Hub
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: openstack-experimental

.github/workflows/container-publish.yml

@@ -39,7 +39,7 @@ jobs:
 
       # Uses the `docker/login-action` action to log in to the Container registry registry using the account and password that will publish the packages. Once published, the packages are scoped to the account defined here.
       - name: Log in to the Container registry
-        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772  # v3.4.0
+        uses: docker/login-action@b45d80f862d83dbcd57f89517bcf500b2ab88fb2  # v4.0.0
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}

.github/workflows/functional.yml

@@ -389,7 +389,7 @@ jobs:
           sudo install skaffold /usr/local/bin/
 
       - name: Log in to GHCR
-        uses: docker/login-action@74a5d142397b4f367a81961eba4e8cd7edddf772  # v3.4.0
+        uses: docker/login-action@b45d80f862d83dbcd57f89517bcf500b2ab88fb2  # v4.0.0
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}