Bump erb from 6.0.2 to 6.0.4

Bumps [erb](https://github.com/ruby/erb) from 6.0.2 to 6.0.4.
- [Release notes](https://github.com/ruby/erb/releases)
- [Changelog](https://github.com/ruby/erb/blob/master/NEWS.md)
- [Commits](https://github.com/ruby/erb/compare/v6.0.2...v6.0.4)

---
updated-dependencies:
- dependency-name: erb
  dependency-version: 6.0.4
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -98,7 +98,7 @@ GEM
     daemons (1.4.1)
     date (3.5.1)
     drb (2.2.3)
-    erb (6.0.2)
+    erb (6.0.4)
     erubi (1.13.1)
     et-orbi (1.4.0)
       tzinfo