tests: timeout: increase delay on macOS for forward_sigint_to_child - #11874

Process completed with exit code 2.

Process completed with exit code 1.

Cache save failed.

You've hit a rate limit, your rate limit will reset in 29 seconds

Failed to restore: Failed to GetCacheEntryDownloadURL: Rate limited: Failed request: (429) Too Many Requests: rate limit exceeded

You've hit a rate limit, your rate limit will reset in 25 seconds

Cache save failed.