ci(publish): try to fix commands referring to environment variables

Author: goldenstein64

.github/workflows/publish.yml

@@ -25,15 +25,15 @@ jobs:
       - name: Get Rockspec Version
         run: |
           [[ "${{ github.ref_name }}" =~ ^v(.+)$ ]]
-          echo "spec_version=${BASH_REMATCH[1]}" >> $env:GITHUB_ENV
+          echo "spec_version=${BASH_REMATCH[1]}" >> $GITHUB_ENV
 
       - name: Publish to LuaRocks
         run: |
           luarocks upload \
-            "rockspec/luarocks-build-lls-addon-${env:spec_version}.rockspec" \
+            "rockspec/luarocks-build-lls-addon-${spec_version}.rockspec" \
             --api-key=${{ secrets.LUAROCKS_API_KEY }}
 
       - name: Create GitHub Release
         uses: softprops/action-gh-release@v2
         with:
-          files: "luarocks-build-lls-addon-${env:spec_version}.src.rock"
+          files: "luarocks-build-lls-addon-${spec_version}.src.rock"