deps: Bump `com_github_gperftools_gperftools` -> 2.15

[dependency-envoy[bot]]

Created by Envoy dependency bot for @phlax

Fix #35687

Signed-off-by: dependency-envoy[bot] <148525496+dependency-envoy[bot]@users.noreply.github.com>

[repokitteh-read-only[bot]]

CC @envoyproxy/dependency-shepherds: Your approval is needed for changes made to (bazel/.*repos.*\.bzl)|(bazel/dependency_imports\.bzl)|(api/bazel/.*\.bzl)|(.*/requirements\.txt)|(.*\.patch). envoyproxy/dependency-shepherds assignee is @RyanTheOptimist

:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/35864 was opened by dependency-envoy[bot].

see: more, trace.

[phlax]

this one has issues

/wait

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[github-actions[bot]]

This pull request has been automatically closed because it has not had activity in the last 37 days. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!