Changed to prevent uvloop install under Python 3.11-dev due to build error

Author: Andrew J Westlake

.github/workflows/ci.yml

@@ -139,7 +139,8 @@ jobs:
       - name: Build
         run: cargo build --features=${{env.features}} --verbose --target ${{ matrix.platform.rust-target }}
 
-      - if: matrix.platform.os != 'windows-latest'
+      # uvloop doesn't compile under Windows or Python 3.11-dev
+      - if: ${{ matrix.platform.os != 'windows-latest' && matrix.python-version != "3.11-dev" }}
         name: Install pyo3-asyncio test dependencies
         run: |
           python -m pip install -U uvloop