CI - test cirq compatibility under Python 3.10 (#673)

CI - test cirq compatibility using Python 3.10

cirq requires minimum Python version 3.10.  Running under
Python 3.7 installs cirq from June 2023.

Also change the pip3 command to install a pre-release of cirq
with stable dependencies.

Run the "Format check" job under Python 3.10 as well.

.github/workflows/cirq_compatibility.yml

@@ -12,10 +12,10 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.7'
+          python-version: '3.10'
           architecture: 'x64'
       - name: Install Cirq nightly
-        run: pip3 install -U cirq --pre
+        run: pip3 install --upgrade cirq~=1.0.dev
       - name: Install qsim requirements
         run: pip3 install -r requirements.txt
       - name: Install test requirements

.github/workflows/python_format.yml

@@ -22,7 +22,7 @@ jobs:
           fetch-depth: 0
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.7'
+          python-version: '3.10'
           architecture: 'x64'
       - name: Install dev requirements
         run: pip install -r dev-requirements.txt