Merge pull request #18 from oracle-samples/fixci

Fix ref

Author: ddrechse

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
       uses: actions/checkout@v2
       with:
         repository: parse-community/parse-server
-        ref:  7.3.0-alpha.7
+        ref: ${{ matrix.version }}
         path: parse-server
     - name: Checkout templateCodeAndSpecs
       uses: actions/checkout@v2