TestCompaction/set_with_del_sstable_Pebblev7 timeout

[github-actions]

The nightly linux-race test run failed on a0b3f26 (go1.23). Please review the run here.

Jira issue: PEBBLE-1307

[xinhaoz]

panic: test timed out after 20m0s
	running tests:
		TestCompaction (19m42s)
		TestCompaction/set_with_del_sstable_Pebblev7 (19m39s)