Upgrade to Python 3.10 because Keras now requires it. (#2109)

Author: hertschuh

.github/ISSUE_TEMPLATE/keras_issue_template.yaml

@@ -72,7 +72,7 @@ body:
     attributes:
       label: Python version
       description: 
-      placeholder: e.g., 3.9
+      placeholder: e.g., 3.10
     validations:
       required: false
   - type: input

.github/workflows/continuous_integration.yml

@@ -15,7 +15,7 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions/setup-python@v1
       with:
-        python-version: 3.9
+        python-version: 3.10.17
     - name: Ensure files are formatted with black
       run: |
         pip install --upgrade pip

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9
+FROM python:3.10
 
 COPY requirements.txt ./
 RUN pip install -r requirements.txt