Bump mini_mime from 1.1.0 to 1.1.5

Bumps [mini_mime](https://github.com/discourse/mini_mime) from 1.1.0 to 1.1.5.
- [Changelog](https://github.com/discourse/mini_mime/blob/main/CHANGELOG)
- [Commits](discourse/mini_mime@v1.1.0...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>

Gemfile.lock

@@ -204,7 +204,7 @@ GEM
     mimemagic (0.3.10)
       nokogiri (~> 1)
       rake
-    mini_mime (1.1.0)
+    mini_mime (1.1.5)
     mini_portile2 (2.4.0)
     minitest (5.14.4)
     mocha (1.12.0)