Bump angular-ui-bootstrap from 1.3.3 to 2.5.6

Bumps [angular-ui-bootstrap](https://github.com/angular-ui/bootstrap) from 1.3.3 to 2.5.6.
- [Release notes](https://github.com/angular-ui/bootstrap/releases)
- [Changelog](https://github.com/angular-ui/bootstrap/blob/master/CHANGELOG.md)
- [Commits](angular-ui/bootstrap@1.3.3...2.5.6)

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

package.json

@@ -22,7 +22,7 @@
     "add-stream": "^1.0.0",
     "angular": "^1.7.4",
     "angular-mocks": "^1.7.4",
-    "angular-ui-bootstrap": "1.3.x",
+    "angular-ui-bootstrap": "2.5.x",
     "bootstrap-sass": "3.4.x",
     "del": "^6.0.0",
     "gulp": "^3.9.0",