runtime/pprof: TestProfilerStackDepth/mutex times out

[gopherbot]

#!watchflakes
default <- pkg == "runtime/pprof" && test == "TestProfilerStackDepth/mutex" && `test timed out`

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestEmptyCallStack
=== PAUSE TestEmptyCallStack

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime/pprof" && test == "TestEmptyCallStack"

2024-07-23 21:29 gotip-windows-386 go@c18ff292 runtime/pprof.TestEmptyCallStack [ABORT] (log)

=== RUN   TestEmptyCallStack
=== PAUSE TestEmptyCallStack

— watchflakes

[mknyszek]

Duplicate of #68562.