runtime/pprof: TestProfilerStackDepth/heap failures

[gopherbot]

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

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestProfilerStackDepth/heap
*** Test killed: ran too long (49m30s).

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

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

2025-06-05 18:44 gotip-windows-amd64-longtest go@4d1c255f runtime/pprof.TestProfilerStackDepth/heap [SKIP] (log)

=== RUN   TestProfilerStackDepth/heap
*** Test killed: ran too long (49m30s).

— watchflakes

[mknyszek]

It really does seem to be this test spending 49m30s before timing out, despite the [SKIP] above.