fixup! Update GCC version #2433

Job	Run time
build_system	26s
build (gcc-15.deb, --std-tests)	6m 0s
duplicates	3s
build (gcc-15.deb, --test-libcore)	14m 2s
build (gcc-15.deb, --extended-rand-tests)	8m 23s
build (gcc-15.deb, --extended-regex-example-tests)	6m 35s
build (gcc-15.deb, --extended-regex-tests)	12m 13s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	12m 9s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	11m 23s
build (gcc-15.deb, --projects)	11m 26s
build (gcc-15-without-int128.deb, --std-tests)	6m 11s
build (gcc-15-without-int128.deb, --test-libcore)	14m 11s
build (gcc-15-without-int128.deb, --extended-rand-tests)	8m 36s
build (gcc-15-without-int128.deb, --extended-regex-example-tests)	6m 34s
build (gcc-15-without-int128.deb, --extended-regex-tests)	11m 42s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	11m 18s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	11m 28s
build (gcc-15-without-int128.deb, --projects)	11m 22s
	2h 44m 2s

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