Bump stackprof from 0.2.14 to 0.2.15 (#12726)

Bumps [stackprof](https://github.com/tmm1/stackprof) from 0.2.14 to 0.2.15.
- [Release notes](https://github.com/tmm1/stackprof/releases)
- [Changelog](https://github.com/tmm1/stackprof/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tmm1/stackprof/compare/v0.2.14...v0.2.15)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile.lock

@@ -615,7 +615,7 @@ GEM
     sshkit (1.20.0)
       net-scp (>= 1.1.2)
       net-ssh (>= 2.8.0)
-    stackprof (0.2.14)
+    stackprof (0.2.15)
     statsd-ruby (1.4.0)
     stoplight (2.2.0)
     streamio-ffmpeg (3.0.2)