Upgrade CI to Py38. (#497)

Author: MichaelBroughton

.github/workflows/ci.yaml

@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-python@v1
         with:
-          python-version: '3.6'
+          python-version: '3.8'
           architecture: 'x64'
       - name: Install Lint tools
         run: pip install --upgrade pip setuptools; pip install -r requirements.txt;
@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-python@v1
         with:
-          python-version: '3.6'
+          python-version: '3.8'
           architecture: 'x64'
       - name: Install Format tools
         run: pip install --upgrade pip setuptools; pip install -r requirements.txt; sudo apt-get install -y clang-format-6.0
@@ -40,7 +40,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-python@v1
         with:
-          python-version: '3.6'
+          python-version: '3.8'
           architecture: 'x64'
       - name: Install Bazel on CI
         run: ./scripts/ci_install.sh
@@ -60,7 +60,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-python@v1
         with:
-          python-version: '3.6'
+          python-version: '3.8'
           architecture: 'x64'
       - name: Install Bazel on CI
         run: ./scripts/ci_install.sh
@@ -78,7 +78,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-python@v1
         with:
-          python-version: '3.6'
+          python-version: '3.8'
           architecture: 'x64'
       - name: Install Bazel on CI
         run: ./scripts/ci_install.sh
@@ -96,7 +96,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-python@v1
         with:
-          python-version: '3.6'
+          python-version: '3.8'
           architecture: 'x64'
       - name: Install notebook dependencies
         run: pip install --upgrade pip seaborn==0.10.0

.github/workflows/cirq_compatibility.yaml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions/setup-python@v1
         with:
-          python-version: '3.7'
+          python-version: '3.8'
           architecture: 'x64'
       - name: Install Bazel on CI
         run: ./scripts/ci_install.sh

scripts/ci_validate_tutorials.sh

@@ -15,7 +15,7 @@
 # ==============================================================================
 
 # Run the tutorials using the installed pip package
-pip install jupyter nbformat==4.4.0 nbconvert==5.6.1
+pip install jupyter nbformat==4.4.0 nbconvert==5.5.0
 # Workaround for ipykernel - see https://github.com/ipython/ipykernel/issues/422
 pip install ipykernel==5.1.1
 # Leave the quantum directory, otherwise errors may occur