build(deps): bump docker/login-action from 3.3.0 to 3.4.0 (#8090)

Bumps [docker/login-action](https://github.com/docker/login-action) from
3.3.0 to 3.4.0.

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/boulder-ci.yml

@@ -71,7 +71,7 @@ jobs:
       - name: Docker Login
         # You may pin to the exact commit or the version.
         # uses: docker/login-action@f3364599c6aa293cdc2b8391b1b56d0c30e45c8a
-        uses: docker/login-action@v3.3.0
+        uses: docker/login-action@v3.4.0
         with:
           # Username used to log against the Docker registry
           username: ${{ secrets.DOCKER_USERNAME}}