Bump bower from 1.8.2 to 1.8.4

Bumps [bower](https://github.com/bower/bower) from 1.8.2 to 1.8.4.
- [Release notes](https://github.com/bower/bower/releases)
- [Changelog](https://github.com/bower/bower/blob/master/CHANGELOG.md)
- [Commits](bower/bower@v1.8.2...v1.8.4)

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

Author: dependabot-support

yarn.lock

@@ -1290,9 +1290,9 @@ bootstrap@>=3.0.0:
   integrity sha1-WjiTlFSfIzMIdaOxUGVldPip63E=
 
 bower@^1.8.0:
-  version "1.8.2"
-  resolved "https://registry.yarnpkg.com/bower/-/bower-1.8.2.tgz#adf53529c8d4af02ef24fb8d5341c1419d33e2f7"
-  integrity sha1-rfU1KcjUrwLvJPuNU0HBQZ0z4vc=
+  version "1.8.4"
+  resolved "https://registry.yarnpkg.com/bower/-/bower-1.8.4.tgz#e7876a076deb8137f7d06525dc5e8c66db82f28a"
+  integrity sha1-54dqB23rgTf30GUl3F6MZtuC8oo=
 
 brace-expansion@^1.1.7:
   version "1.1.8"