update alpine base docker image. See if it clears security scan issues

Author: rouilj

scripts/Docker/Dockerfile

@@ -23,7 +23,7 @@ ARG source=local
 
 # parameterize the sha256 sum to pin version of python:3-alpine
 # Must use the same version in both build stages.
-ARG SHA256=a5d1738d6abbdff3e81c10b7f86923ebcb340ca536e21e8c5ee7d938d263dba1
+ARG SHA256=c5bbde5ada8f427a1f2e2fb41f08077bfb4f1c779e82ab7e603a145275bec840
 
 # Set to any non-empy value to enable shell debugging for troubleshooting
 ARG VERBOSE=