Bump mathematical from 1.6.14 to 1.6.18

Bumps [mathematical](https://github.com/gjtorikian/mathematical) from 1.6.14 to 1.6.18.
- [Release notes](https://github.com/gjtorikian/mathematical/releases)
- [Changelog](https://github.com/gjtorikian/mathematical/blob/main/CHANGELOG.md)
- [Commits](gjtorikian/mathematical@v1.6.14...v1.6.18)

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

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

Gemfile.lock

@@ -17,7 +17,7 @@ GEM
   specs:
     ast (2.4.2)
     base64 (0.1.1)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.2.2)
     docopt (0.6.1)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
@@ -29,11 +29,11 @@ GEM
     httparty (0.21.0)
       mini_mime (>= 1.0.0)
       multi_xml (>= 0.5.2)
-    i18n (1.10.0)
+    i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     json (2.6.3)
     language_server-protocol (3.17.0.3)
-    mathematical (1.6.14)
+    mathematical (1.6.18)
       ruby-enum (~> 0.4)
     mime-types (3.4.1)
       mime-types-data (~> 3.2015)