ci: Use GITHUB_OUTPUT envvar instead of set-output command (#33)

Author: arunsathiya

.github/workflows/ci.yml

@@ -57,5 +57,5 @@ jobs:
       - name: Get tag version
         if: contains(matrix.os, 'ubuntu') && startsWith(github.ref, 'refs/tags/')
         id: get_tag_version
-        run: echo ::set-output name=TAG_VERSION::${GITHUB_REF/refs\/tags\//}
+        run: echo TAG_VERSION=${GITHUB_REF/refs\/tags\//} >> "$GITHUB_OUTPUT"