fix command for getting yarn cache di

Author: SimenB

.github/workflows/nodejs.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v2
       - name: Get yarn cache
         id: yarn-cache
-        run: echo "::set-output name=dir::$(yarn cache dir)"
+        run: echo "::set-output name=dir::$(yarn config get cacheFolder)"
       - uses: actions/cache@v1
         with:
           path: ${{ steps.yarn-cache.outputs.dir }}
@@ -66,7 +66,7 @@ jobs:
       - uses: actions/checkout@v2
       - name: Get yarn cache
         id: yarn-cache
-        run: echo "::set-output name=dir::$(yarn cache dir)"
+        run: echo "::set-output name=dir::$(yarn config get cacheFolder)"
       - uses: actions/cache@v1
         with:
           path: ${{ steps.yarn-cache.outputs.dir }}