Bump bower from 1.8.4 to 1.8.9

Bumps [bower](https://github.com/bower/bower) from 1.8.4 to 1.8.9.
- [Release notes](https://github.com/bower/bower/releases)
- [Changelog](https://github.com/bower/bower/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bower/bower/commits)

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

Author: dependabot[bot]

package-lock.json

@@ -4,7 +4,7 @@
   "description": "Web based application for DocDokuPLM server",
   "version": "2.6.1",
   "devDependencies": {
-    "bower": "~1.8.0",
+    "bower": "~1.8.9",
     "casperjs": "1.1.4",
     "connect-livereload": "~0.3.2",
     "del": "~1.2.0",