Bump mini_magick from 4.11.0 to 4.12.0

Bumps [mini_magick](https://github.com/minimagick/minimagick) from 4.11.0 to 4.12.0.
- [Release notes](https://github.com/minimagick/minimagick/releases)
- [Commits](https://github.com/minimagick/minimagick/compare/v4.11.0...v4.12.0)

---
updated-dependencies:
- dependency-name: mini_magick
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -338,7 +338,7 @@ GEM
     mime-types (3.4.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2022.0105)
-    mini_magick (4.11.0)
+    mini_magick (4.12.0)
     mini_mime (1.1.5)
     mini_portile2 (2.8.4)
     minitest (5.19.0)
@@ -717,7 +717,7 @@ DEPENDENCIES
   leaflet-rails (~> 1.9.3)
   letter_opener_web (~> 2.0.0)
   mdl (~> 0.12.0)
-  mini_magick (~> 4.11.0)
+  mini_magick (~> 4.12.0)
   omniauth (~> 2.1.1)
   omniauth-facebook (~> 9.0.0)
   omniauth-google-oauth2 (~> 1.0.1)