CI: Update LCG stacks and OSs for linux workflows

[tmadlener]

BEGINRELEASENOTES

• Update CI workflows to run on LCG_105 using gcc13 and clang16 as well as bumping the OS to EL9. Build RNTuple by default
• Update the Ubuntu based workflows to run on ubuntu 22.04

ENDRELEASENOTES

Additionally clean up the ubuntu workflow slightly to not have a matrix entry that is always ON.

[andresailer]

I think you can now put them all in the

matrix:
  LCG: [...]

[tmadlener]

Good call. The number of c+=17 builds gets small this way, but we will eventually move to full c++20 in any case, I suppose.