Update actions

Author: fabiang

.github/workflows/docker.yml

@@ -53,7 +53,7 @@ jobs:
     name: "Sqlcmd v${{ matrix.version.sqlcmd }} (Ubuntu ${{ matrix.version.ubuntu }})"
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3
 
       - uses: satackey/action-docker-layer-caching@v0.0.11
         continue-on-error: true