selftests: coredump: Raise timeout to 2 minutes

The test's runtime (nearly 20s) is dangerously close to the limit (30s) on
qemu-system-riscv64:

$ time ./stackdump_test > /dev/null
real	0m19.210s
user	0m0.077s
sys	0m0.359s

There could be machines slower than qemu-system-riscv64. Therefore raise
the test timeout to 2 minutes to be safe.

Fixes: 15858da ("selftests: coredump: Add stackdump test")
Signed-off-by: Nam Cao <[email protected]>
Link: https://lore.kernel.org/dd636084d55e7828782728d087fa2298dcab1c8b.1744383419.git.namcao@linutronix.de
Signed-off-by: Christian Brauner <[email protected]>

Author: covanam

tools/testing/selftests/coredump/stackdump_test.c

@@ -89,7 +89,7 @@ FIXTURE_TEARDOWN(coredump)
 	fprintf(stderr, "Failed to cleanup stackdump test: %s\n", reason);
 }
 
-TEST_F(coredump, stackdump)
+TEST_F_TIMEOUT(coredump, stackdump, 120)
 {
 	struct sigaction action = {};
 	unsigned long long stack;