Bump terser from 1.2.3 to 1.2.4

Bumps [terser](https://github.com/ahorek/terser-ruby) from 1.2.3 to 1.2.4.
- [Release notes](https://github.com/ahorek/terser-ruby/releases)
- [Changelog](https://github.com/ahorek/terser-ruby/blob/master/CHANGELOG.md)
- [Commits](ahorek/terser-ruby@1.2.3...1.2.4)

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

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

Gemfile.lock

@@ -606,7 +606,7 @@ GEM
       sprockets (>= 3.0.0)
     statsd-ruby (1.5.0)
     stringio (3.1.1)
-    terser (1.2.3)
+    terser (1.2.4)
       execjs (>= 0.3.0, < 3)
     thor (1.3.2)
     timecop (0.9.10)