Bump thor from 0.20.0 to 0.20.3 (#9266)

Bumps [thor](https://github.com/wycats/thor) from 0.20.0 to 0.20.3.
- [Release notes](https://github.com/wycats/thor/releases)
- [Changelog](https://github.com/erikhuda/thor/blob/master/CHANGELOG.md)
- [Commits](https://github.com/wycats/thor/compare/v0.20.0...v0.20.3)

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

Gemfile.lock

@@ -594,7 +594,7 @@ GEM
       unicode-display_width (~> 1.1, >= 1.1.1)
     terrapin (0.6.0)
       climate_control (>= 0.0.3, < 1.0)
-    thor (0.20.0)
+    thor (0.20.3)
     thread_safe (0.3.6)
     tilt (2.0.8)
     timers (4.2.0)