⬆️ Bump webpacker from 5.0.1 to 5.1.0

Bumps [webpacker](https://github.com/rails/webpacker) from 5.0.1 to 5.1.0.
- [Release notes](https://github.com/rails/webpacker/releases)
- [Changelog](https://github.com/rails/webpacker/blob/master/CHANGELOG.md)
- [Commits](rails/webpacker@v5.0.1...v5.1.0)

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

Gemfile.lock

@@ -414,7 +414,7 @@ GEM
       nokogiri (~> 1.6)
       rubyzip (>= 1.3.0)
       selenium-webdriver (>= 3.0, < 4.0)
-    webpacker (5.0.1)
+    webpacker (5.1.0)
       activesupport (>= 5.2)
       rack-proxy (>= 0.6.1)
       railties (>= 5.2)