Bump parser from 3.1.1.0 to 3.1.2.0 in /.overcommit

Bumps [parser](https://github.com/whitequark/parser) from 3.1.1.0 to 3.1.2.0.
- [Release notes](https://github.com/whitequark/parser/releases)
- [Changelog](https://github.com/whitequark/parser/blob/master/CHANGELOG.md)
- [Commits](whitequark/parser@v3.1.1.0...v3.1.2.0)

---
updated-dependencies:
- dependency-name: parser
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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

.overcommit/Gemfile.lock

@@ -32,7 +32,7 @@ GEM
       iniparse (~> 1.4)
       rexml (~> 3.2)
     parallel (1.22.1)
-    parser (3.1.1.0)
+    parser (3.1.2.0)
       ast (~> 2.4.1)
     rack (2.2.3)
     rainbow (3.1.1)