Bump mobx from 6.6.2 to 6.7.0 (#6593)

Bumps [mobx](https://github.com/mobxjs/mobx) from 6.6.2 to 6.7.0.
- [Release notes](https://github.com/mobxjs/mobx/releases)
- [Commits](https://github.com/mobxjs/mobx/compare/mobx@6.6.2...mobx@6.7.0)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -255,7 +255,7 @@
     "mac-ca": "^1.0.6",
     "marked": "^4.2.2",
     "md5-file": "^5.0.0",
-    "mobx": "^6.6.2",
+    "mobx": "^6.7.0",
     "mobx-observable-history": "^2.0.3",
     "mobx-react": "^7.6.0",
     "mobx-utils": "^6.0.4",