Bump octicons_helper from 19.15.4 to 19.15.5

Bumps [octicons_helper](https://github.com/primer/octicons) from 19.15.4 to 19.15.5.
- [Release notes](https://github.com/primer/octicons/releases)
- [Changelog](https://github.com/primer/octicons/blob/main/CHANGELOG.md)
- [Commits](primer/octicons@v19.15.4...v19.15.5)

---
updated-dependencies:
- dependency-name: octicons_helper
  dependency-version: 19.15.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -252,10 +252,10 @@ GEM
       rack (>= 1.2, < 4)
       snaky_hash (~> 2.0)
       version_gem (~> 1.1)
-    octicons (19.15.4)
-    octicons_helper (19.15.4)
+    octicons (19.15.5)
+    octicons_helper (19.15.5)
       actionview
-      octicons (= 19.15.4)
+      octicons (= 19.15.5)
       railties
     octokit (10.0.0)
       faraday (>= 1, < 3)