build(deps): bump terser from 1.1.20 to 1.2.0

Bumps [terser](https://github.com/ahorek/terser-ruby) from 1.1.20 to 1.2.0.
- [Release notes](https://github.com/ahorek/terser-ruby/releases)
- [Changelog](https://github.com/ahorek/terser-ruby/blob/master/CHANGELOG.md)
- [Commits](ahorek/terser-ruby@1.1.20...1.2.0)

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

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

Gemfile.lock

@@ -355,7 +355,7 @@ GEM
     sshkit (1.21.5)
       net-scp (>= 1.1.2)
       net-ssh (>= 2.8.0)
-    terser (1.1.20)
+    terser (1.2.0)
       execjs (>= 0.3.0, < 3)
     thor (1.3.0)
     tilt (2.2.0)