ci: use ubuntu v24 for GNU tests workflow · uutils/coreutils@91e7355

GNU test failed: tests/ls/stat-free-symlinks. tests/ls/stat-free-symlinks is passing on 'main'. Maybe you have to rebase?

GNU test failed: tests/timeout/timeout. tests/timeout/timeout is passing on 'main'. Maybe you have to rebase?

Process completed with exit code 255.

PASS count is reduced from 'main': PASS -1

Process completed with exit code 1.

Congrats! The gnu test tests/rm/rm2 is no longer failing!

GNU tests summary = TOTAL: 613 / PASS: 474 / FAIL: 95 / ERROR: 0 / SKIP: 44

Changes from 'main': PASS -1 / FAIL +1 / ERROR +0 / SKIP +0

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