Run unit tests with pydantic v1 now that v2 is installed via poetry

.github/workflows/unit_tests.yml

@@ -77,9 +77,9 @@ jobs:
           export REDIS_URL=redis://localhost:6379
           poetry run pytest tests --cov --no-cov-on-fail --cov-report=
       # Change to explicitly install v1 when reflex-hosting-cli is compatible with v2
-      - name: Run unit tests w/ pydantic v2
+      - name: Run unit tests w/ pydantic v1
         run: |
           export PYTHONUNBUFFERED=1
-          poetry run pip install "pydantic>2"
+          poetry run pip install "pydantic~=1.10"
           poetry run pytest tests --cov --no-cov-on-fail --cov-report=
       - run: poetry run coverage html