chore(deps): bump mobx from 6.8.0 to 6.12.0

Bumps [mobx](https://github.com/mobxjs/mobx) from 6.8.0 to 6.12.0.
- [Release notes](https://github.com/mobxjs/mobx/releases)
- [Commits](https://github.com/mobxjs/mobx/commits/mobx@6.12.0)

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

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

package.json

@@ -129,7 +129,7 @@
     "lodash": "^4.17.19",
     "marked": "0.7.0",
     "mini-css-extract-plugin": "^2.7.2",
-    "mobx": "^6.8.0",
+    "mobx": "^6.12.0",
     "mobx-react": "~7.6.0",
     "mockdate": "3.0.5",
     "moment": "2.29.4",

yarn.lock

@@ -8671,10 +8671,10 @@ mobx-react@~7.6.0:
   dependencies:
     mobx-react-lite "^3.4.0"
 
-mobx@^6.8.0:
-  version "6.8.0"
-  resolved "https://registry.yarnpkg.com/mobx/-/mobx-6.8.0.tgz#59051755fdb5c8a9f3f2e0a9b6abaf86bab7f843"
-  integrity sha512-+o/DrHa4zykFMSKfS8Z+CPSEg5LW9tSNGTuN8o6MF1GKxlfkSHSeJn5UtgxvPkGgaouplnrLXCF+duAsmm6FHQ==
+mobx@^6.12.0:
+  version "6.12.0"
+  resolved "https://registry.yarnpkg.com/mobx/-/mobx-6.12.0.tgz#72b2685ca5af031aaa49e77a4d76ed67fcbf9135"
+  integrity sha512-Mn6CN6meXEnMa0a5u6a5+RKrqRedHBhZGd15AWLk9O6uFY4KYHzImdt8JI8WODo1bjTSRnwXhJox+FCUZhCKCQ==
 
 mockdate@3.0.5:
   version "3.0.5"