Bump mnemosyne-ruby from 2.1.1 to 2.1.2

Bumps [mnemosyne-ruby](https://github.com/jgraichen/mnemosyne-ruby) from 2.1.1 to 2.1.2.
- [Release notes](https://github.com/jgraichen/mnemosyne-ruby/releases)
- [Changelog](https://github.com/mnemosyne-mon/mnemosyne-ruby/blob/main/CHANGELOG.md)
- [Commits](mnemosyne-mon/mnemosyne-ruby@v2.1.1...v2.1.2)

---
updated-dependencies:
- dependency-name: mnemosyne-ruby
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -272,7 +272,7 @@ GEM
     mini_mime (1.1.5)
     mini_portile2 (2.8.8)
     minitest (5.25.4)
-    mnemosyne-ruby (2.1.1)
+    mnemosyne-ruby (2.1.2)
       activesupport (>= 6.1)
       bunny
     msgpack (1.7.5)