Fix a setup-node warning

setup-node currently outputs:

##[warning]Input 'version' has been deprecated with message: The version property will not be supported after October 1, 2019. Use node-version instead

.github/workflows/unit-tests.yml

@@ -17,7 +17,7 @@ jobs:
     - name: Set Node.js 10.x
       uses: actions/setup-node@master
       with:
-        version: 10.x
+        node-version: 10.x
 
     - name: npm install
       run: npm install
@@ -46,7 +46,7 @@ jobs:
       - name: Set Node.js 10.x
         uses: actions/setup-node@master
         with:
-          version: 10.x
+          node-version: 10.x
 
       - name: npm install
         run: npm install
@@ -69,7 +69,7 @@ jobs:
     - name: Set Node.js 10.x
       uses: actions/setup-node@master
       with:
-        version: 10.x
+        node-version: 10.x
 
     - name: npm install
       run: npm install