Build(deps): Bump mini_mime from 1.1.2 to 1.1.5 in /Builder

Bumps [mini_mime](https://github.com/discourse/mini_mime) from 1.1.2 to 1.1.5.
- [Changelog](https://github.com/discourse/mini_mime/blob/main/CHANGELOG)
- [Commits](discourse/mini_mime@v1.1.2...v1.1.5)

---
updated-dependencies:
- dependency-name: mini_mime
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

Builder/Gemfile.lock

@@ -123,7 +123,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2023.0808)
     mini_magick (4.12.0)
-    mini_mime (1.1.2)
+    mini_mime (1.1.5)
     mini_portile2 (2.8.4)
     minitest (5.19.0)
     msgpack (1.7.2)