fix(ci): make yarn cache specific to node version

Author: nklayman

.github/workflows/nodeCI.yml

@@ -32,9 +32,9 @@ jobs:
       uses: actions/cache@v1
       with:
         path: ${{ steps.yarn-cache.outputs.dir }}
-        key: ${{ runner.os }}-yarn-${{ hashFiles('yarn.lock') }}
+        key: ${{ runner.os }}-yarn-node${{ matrix.node }}-${{ hashFiles('yarn.lock') }}
         restore-keys: |
-          ${{ runner.os }}-yarn-
+          ${{ runner.os }}-yarn-node${{ matrix.node }}-
     - name: yarn install
       run: yarn install
     - name: yarn test