update ci.yml to test Nim 2.2; also test gcc-14

[narimiran]

No description provided.

[metagn]

The Windows failure happens in test_io after Nim commit nim-lang/Nim@8f5ae28. The issue seems to be with clang's stack protection, the new generated code breaks it in some way that causes __chkstk_ms to be called repeatedly. Changing the compiler options to as little as --passC:"-O1" makes it work, but none of the switches I tried that disabled the stack protection worked. -d:release and even --debugger:gdb also makes it work but --linedir:on which --debugger:gdb enables doesn't.

[tersec]

The Windows failure happens in test_io after Nim commit nim-lang/Nim@8f5ae28. The issue seems to be with clang's stack protection, the new generated code breaks it in some way that causes __chkstk_ms to be called repeatedly. Changing the compiler options to as little as --passC:"-O1" makes it work, but none of the switches I tried that disabled the stack protection worked. -d:release and even --debugger:gdb also makes it work but --linedir:on which --debugger:gdb enables doesn't.

To the extent this is a clang issue, what we've done before on these is check if newer versions of clang have fixed it -- if so, can note that and also see if there's some workaround in the meantime. But especially on Windows, clang isn't a native compiler tied to the OS, so it's ok to just require newer clang versions.

[arnetheduck]

as with the other low-level libraries, this should test 1.6 as well (in particular, it should test what the nimble file specifies as compatible)