python 3.7 fell off EOL. upgrade to 3.11

Dockerfile

@@ -11,7 +11,7 @@ COPY . .
 RUN npm run build
 
 # -----------------------------------------------------------------------------
-FROM python:3.7 as backend
+FROM python:3.11 as backend
 
 RUN mkdir /opt/cosri-patientsearch
 WORKDIR /opt/cosri-patientsearch

README.md

@@ -9,7 +9,7 @@ All views require Keycloak authentication.  Keycloak roles determine authorizati
 1) `git clone <this repository>`
 2) `cp client_secrets.json.default client_secrets.json`  # Edit to fit
 3) `cp patientsearch.env.default patientsearch.env`  # Edit to fit
-4) `mkvirtualenv patientsearch`  # Python 3.7
+4) `mkvirtualenv patientsearch`  # Python 3.11
 5) `pip install nodeenv`
 6) `nodeenv --python-virtualenv`
 7) `pip install -e .`