Bump simplecov-html from 0.12.3 to 0.13.1 (#491)

Bumps [simplecov-html](https://github.com/simplecov-ruby/simplecov-html) from 0.12.3 to 0.13.1.
- [Release notes](https://github.com/simplecov-ruby/simplecov-html/releases)
- [Changelog](https://github.com/simplecov-ruby/simplecov-html/blob/main/CHANGELOG.md)
- [Commits](simplecov-ruby/simplecov-html@v0.12.3...v0.13.1)

---
updated-dependencies:
- dependency-name: simplecov-html
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -67,7 +67,7 @@ GEM
       docile (~> 1.1)
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
-    simplecov-html (0.12.3)
+    simplecov-html (0.13.1)
     simplecov_json_formatter (0.1.4)
     unicode-display_width (2.5.0)
     yard (0.9.37)