use latest 3-alpine at 18M rather than latest ubuntu based python image, dependabot seems to not properly track subypes

Author: rouilj

scripts/Docker/Dockerfile

@@ -24,7 +24,7 @@ ARG source=local
 ARG pythonversion=3.11
 
 #FROM python:3-alpine
-FROM python@sha256:f7382f4f9dbc51183c72d621b9c196c1565f713a1fe40c119d215c961fa22815 as build
+FROM python@sha256:507818d46649f8543e58d19a00e3a1a428bb7e87c0bf7f7d1ffe7b076cda11be as build
 
 # Inherit global values https://github.com/moby/moby/issues/37345
 ARG appdir
@@ -133,7 +133,7 @@ RUN if [ -n "$pip_mod" ]; then pip install --no-cache-dir ${pip_mod}; fi
 # build a new smaller docker image for execution. Build image above
 # is 1G in size.
 # FROM python:3-alpine
-FROM python@sha256:f7382f4f9dbc51183c72d621b9c196c1565f713a1fe40c119d215c961fa22815 
+FROM python@sha256:507818d46649f8543e58d19a00e3a1a428bb7e87c0bf7f7d1ffe7b076cda11be
 
 # import from global
 ARG appdir