Bump parser from 3.3.3.0 to 3.3.4.0 in /gemfiles/2.7

Bumps [parser](https://github.com/whitequark/parser) from 3.3.3.0 to 3.3.4.0.
- [Changelog](https://github.com/whitequark/parser/blob/master/CHANGELOG.md)
- [Commits](whitequark/parser@v3.3.3.0...v3.3.4.0)

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

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

gemfiles/2.7/Gemfile.lock

@@ -9,7 +9,7 @@ GEM
     ast (2.4.2)
     ffi (1.16.3)
     onigmo (0.1.0)
-    parser (3.3.3.0)
+    parser (3.3.4.0)
       ast (~> 2.4.1)
       racc
     power_assert (2.0.3)