fix(ci): update fastapi tests (pydantic#3690)

* use python 3.10 to run fastapi tests

* fix fastapi test call

Author: PrettyWood

.github/workflows/ci.yml

@@ -244,7 +244,7 @@ jobs:
     - name: set up python
       uses: actions/setup-python@v2
       with:
-        python-version: '3.7'
+        python-version: '3.10'
 
     - name: install
       run: make install-testing

tests/test_fastapi.sh

@@ -12,4 +12,4 @@ git checkout "${latest_tag}"
 pip install -U flit
 flit install
 
-PYTHONPATH=./docs/src pytest
+./scripts/test.sh