build(deps): bump docker/login-action from 2.1.0 to 2.2.0 (#6973)

Bumps https://github.com/docker/login-action from 2.1.0 to 2.2.0.

- Release notes: https://github.com/docker/login-action/releases/tag/v2.2.0
- Commits: docker/login-action@v2.1.0...v2.2.0

Author: dependabot[bot]

.github/workflows/boulder-ci.yml

@@ -77,7 +77,7 @@ jobs:
       - name: Docker Login
         # You may pin to the exact commit or the version.
         # uses: docker/login-action@f3364599c6aa293cdc2b8391b1b56d0c30e45c8a
-        uses: docker/login-action@v2.1.0
+        uses: docker/login-action@v2.2.0
         with:
           # Username used to log against the Docker registry
           username: ${{ secrets.DOCKER_USERNAME}}