Fixed deprecating set-output command (#250)

Author: shibayan

.github/workflows/publish.yml

@@ -20,7 +20,7 @@ jobs:
 
     - name: Setup Version
       id: setup_version
-      run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\/v/}
+      run: echo "VERSION=${GITHUB_REF/refs\/tags\/v/}" >> $GITHUB_OUTPUT
 
     - name: Pack NuGet Package
       run: dotnet pack Sharprompt/Sharprompt.csproj -c Release -o ./dist -p:Version=${{ steps.setup_version.outputs.VERSION }}