Using python 3.11 in release docker image.

Dev Image stays at 3.7 to quickly find compatibility issues.

development.dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.11-slim
+FROM python:3.7-slim
 
 RUN apt update && apt install curl -y
 

release.dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.10-slim
+FROM python:3.11-slim
 
 RUN python -m pip install nicegui