Bump docker/login-action from 3.4.0 to 3.6.0

Bumps [docker/login-action](https://github.com/docker/login-action) from 3.4.0 to 3.6.0.
- [Release notes](https://github.com/docker/login-action/releases)
- [Commits](docker/login-action@v3.4.0...v3.6.0)

---
updated-dependencies:
- dependency-name: docker/login-action
  dependency-version: 3.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/docker.yml

@@ -24,7 +24,7 @@ jobs:
         uses: docker/[email protected]
 
       - name: Log in to Docker Hub
-        uses: docker/login-action@v3.4.0
+        uses: docker/login-action@v3.6.0
         with:
           username: niprepsbot
           password: ${{ secrets.DOCKER_TOKEN }}