Update workflow env setting.

Author: yossigo

.github/workflows/tags.yml

@@ -12,7 +12,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: Determine version
       run: |
-          echo "::set-env name=VERSION::${GITHUB_REF##*/}"
+          echo "VERSION=${GITHUB_REF##*/}" >> $GITHUB_ENV
     - uses: actions/checkout@v2
       with:
         repository: redis/redis