DEV: Bump parser from 2.7.1.1 to 2.7.1.2 (#9602)

Bumps [parser](https://github.com/whitequark/parser) from 2.7.1.1 to 2.7.1.2.
- [Release notes](https://github.com/whitequark/parser/releases)
- [Changelog](https://github.com/whitequark/parser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/whitequark/parser/compare/v2.7.1.1...v2.7.1.2)

Very minor, used for ruby 2.7 support

Gemfile.lock

@@ -253,7 +253,7 @@ GEM
     parallel (1.19.1)
     parallel_tests (2.32.0)
       parallel
-    parser (2.7.1.1)
+    parser (2.7.1.2)
       ast (~> 2.4.0)
     pg (1.2.3)
     progress (3.5.2)