Don't write global.json while updating API docs

.github/workflows/api_docs.yml

@@ -31,12 +31,6 @@ jobs:
       - name: Setup dotnet
         uses: actions/setup-dotnet@v3
         id: setup-dotnet
-        with:
-          dotnet-version: '6.0.x'
-
-      - name: Create temporary global.json
-        run: |
-          echo '{"sdk":{"version": "${{ steps.setup-dotnet.outputs.dotnet-version }}" } }' > ./global.json
 
       - name: Create openapi.json
         run: ./docs.sh Linux