temporarily pin pip to <23 (#2287)

per pypa/pip#11770

Author: amcadmus

.github/workflows/test_python.yml

@@ -39,7 +39,8 @@ jobs:
     - name: work around permission issue
       run: git config --global --add safe.directory /__w/deepmd-kit/deepmd-kit
     - uses: actions/checkout@v3
-    - run: python -m pip install -U pip>=21.3.1
+    # https://github.com/pypa/pip/issues/11770
+    - run: python -m pip install -U "pip>=21.3.1,<23"
     - run: pip install -e .[cpu,test]
       env:
         CC: gcc-${{ matrix.gcc }}