Use `rb_gc_mark_weak` for `cc->klass`. #11284

Job	Run time
make (check, --disable-yjit)	6m 51s
make (test-bundler-parallel, 50)	28m 25s
make (check, cppflags=-DVM_CHECK_MODE)	9m 13s
make (check, i686)	11m 10s
make (test-bundled-gems)	19m 17s
make (check, --enable-shared --enable-load-relative)	6m 59s
make (check, ubuntu-24.04-arm)	6m 10s
make (check, ubuntu-24.04)	9m 25s
Ubuntu result	3s
	1h 37m 33s

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