Externals Update, main branch (2024.11.15.)

Updated all projects to atlasexternals-2.1.31. It has one set of changes wrt. atlasexternals-2.1.30 (atlasexternals@2.1.30...2.1.31):

• Introduced Findchaplin.cmake, Findcln.cmake, Findggvvamp.cmake, Findqqvvamp.cmake and Findginac.cmake into AtlasLCG (thanks to @averbyts).

The new find-modules are needed for !75809 (closed), and should not affect anything else in the repository. 🤔 So a full-build is not needed on this one.