Merge pull request #412 from stillwater-sc/snyk-fix-f34a2f0e73c66e9e7d3459d51f75dac3

[Snyk] Security upgrade ubuntu from mantic to 23.10

Author: Theodore Omtzigt

docker/Dockerfile.gcc12

@@ -27,7 +27,7 @@ RUN cmake -D$target=ON  -DBUILD_CMD_LINE_TOOLS=ON -DBUILD_DEMONSTRATION=OFF .. &
 # RELEASE stage
 #FROM alpine:latest as release    # hitting a segfault during startup of some playground programs
 #FROM debian:buster-slim as release
-FROM ubuntu:mantic as release
+FROM ubuntu:23.10 as release
 LABEL Theodore Omtzigt
 
 #RUN apk add --no-cache libc6-compat libstdc++ cmake make bash gawk sed grep bc coreutils