Bump parser from 3.3.6.0 to 3.3.7.0 in /gemfiles/truffleruby

Bumps [parser](https://github.com/whitequark/parser) from 3.3.6.0 to 3.3.7.0.
- [Changelog](https://github.com/whitequark/parser/blob/master/CHANGELOG.md)
- [Commits](whitequark/parser@v3.3.6.0...v3.3.7.0)

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

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

Author: dependabot[bot]

gemfiles/truffleruby/Gemfile.lock

@@ -7,7 +7,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
-    parser (3.3.6.0)
+    parser (3.3.7.0)
       ast (~> 2.4.1)
       racc
     power_assert (2.0.5)