update python version to match Heroku default

Author: TimidRobot

.github/workflows/main.yml

@@ -12,10 +12,13 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - name: Set up Python 3.9
+    # https://devcenter.heroku.com/articles/getting-started-with-python
+    # Match version to Heroku app
+    # Keep in sync with Dockerfile and Pipfile
+    - name: Set up Python 3.10
       uses: actions/setup-python@v4
       with:
-        python-version: 3.9
+        python-version: 3.10
 
     - name: Install pipenv
       run: |
@@ -69,10 +72,13 @@ jobs:
       - name: Check out repository code
         uses: actions/checkout@v3
 
-      - name: Set up Python 3.9
+    # https://devcenter.heroku.com/articles/getting-started-with-python
+    # Match version to Heroku app
+    # Keep in sync with Dockerfile and Pipfile
+      - name: Set up Python 3.10
         uses: actions/setup-python@v4
         with:
-          python-version: 3.9
+          python-version: 3.10
 
     - name: Install pipenv
       run: |

Dockerfile

@@ -1,7 +1,10 @@
 # https://docs.docker.com/engine/reference/builder/
 
 # https://hub.docker.com/_/python/
-FROM python:3.9-slim
+# https://devcenter.heroku.com/articles/getting-started-with-python
+# Match version to Heroku app
+# Keep in sync with .github/workflows/main.yml and Pipfile
+FROM python:3.10-slim
 
 # Configure apt not to prompt during docker build
 ARG DEBIAN_FRONTEND=noninteractive

Pipfile

@@ -24,4 +24,7 @@ psycopg2 = "*"
 whitenoise = "*"
 
 [requires]
-python_version = "3.9"
+# https://devcenter.heroku.com/articles/getting-started-with-python
+# Match version to Heroku app
+# Keep in sync with .github/workflows/main.yml and Dockerfile
+python_version = "3.10"