patch release v8.15.7

[kazupon]

Release Summary

• Version change: v8.15.6 → v8.15.7
• Merge: releases/v8.15.7 → v8.x
• Compare the changes between the versions

⚠️ When merging this pull request, you need to "Squash and merge" and make sure the title starts with patch release v8.15.7.
After that, a commit patch release v8.15.7 will be added and shipjs trigger will be able to trigger the release based on the commit.
Fore more information, please refer to the mergeStrategy section of the guide.

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This is going to be published by the following command:

yarn publish --no-git-tag-version --non-interactive --tag latest

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This pull request is automatically generated by Ship.js

[codecov-io]

Codecov Report

Merging #820 into v8.x will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             v8.x     #820   +/-   ##
=======================================
  Coverage   96.29%   96.29%           
=======================================
  Files          10       10           
  Lines         809      809           
=======================================
  Hits          779      779           
  Misses         30       30           

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