Use fork of action-docker-layer-caching to prevent warnings (#1794)

https://github.com/satackey/action-docker-layer-caching hasn't been updated in quite some time.
E.g. GitHub has started to complain about the deprecated `save-state` command.

Solve this by switching to a newer fork.

.github/workflows/docker.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Cache for docker images
-      uses: satackey/action-docker-layer-caching@v0.0.11
+      uses: jpribyl/action-docker-layer-caching@v0.1.1
       # Ignore the failure of a step and avoid terminating the job.
       continue-on-error: true
       with: