CI and CMake Fixes

[ptheywood]

CI and CMake fixes caused by updated dependencies (MSVC 1940, CMake 3.30, Github Actions Node 20)

• Short term CMake FetchContent_Populate deprecation error fix
• Update CUDA versions in CI
• Short term fix for GLIBC error in manylinux 2014 CI - this will need replacing with Manylinux 2_28 as part of https://github.com/FLAMEGPU/FLAMEGPU2/issues/1224
• CI fix and useful warning for MSVC >= 1940 and CUDA <= 12.3 incompatibilty
• Some general tidying / standardisation with the parent repo where code could be reused.