Bump docker_registry2 from 1.8.0 to 1.12.0

Bumps [docker_registry2](https://github.com/deitch/docker_registry2) from 1.8.0 to 1.12.0.
- [Release notes](https://github.com/deitch/docker_registry2/releases)
- [Changelog](https://github.com/deitch/docker_registry2/blob/master/CHANGELOG.md)
- [Commits](https://github.com/deitch/docker_registry2/commits/v1.12.0)

---
updated-dependencies:
- dependency-name: docker_registry2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -8,18 +8,19 @@ GEM
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
     diff-lcs (1.2.5)
-    docker_registry2 (1.8.0)
+    docker_registry2 (1.12.0)
       rest-client (>= 1.8.0)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
     dotenv (2.1.2)
     hashdiff (1.0.0)
-    http-cookie (1.0.3)
+    http-accept (1.7.0)
+    http-cookie (1.0.5)
       domain_name (~> 0.5)
     method_source (0.8.2)
-    mime-types (3.2.2)
+    mime-types (3.4.1)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2019.0331)
+    mime-types-data (3.2022.0105)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     netrc (0.11.0)
@@ -36,7 +37,8 @@ GEM
       rack
     rack-test (0.6.3)
       rack (>= 1.0)
-    rest-client (2.0.2)
+    rest-client (2.1.0)
+      http-accept (>= 1.7.0, < 2.0)
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
@@ -65,7 +67,7 @@ GEM
     timecop (0.8.1)
     unf (0.1.4)
       unf_ext
-    unf_ext (0.0.7.6)
+    unf_ext (0.0.8.2)
     webmock (3.7.1)
       addressable (>= 2.3.6)
       crack (>= 0.3.2)