build(deps-dev): bump @wordpress/url from 2.7.0 to 2.8.0

Bumps [@wordpress/url](https://github.com/WordPress/gutenberg/tree/HEAD/packages/url) from 2.7.0 to 2.8.0.
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/master/packages/url/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/url@2.8.0/packages/url)

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

yarn.lock

@@ -1597,9 +1597,9 @@
     lodash "^4.17.14"
 
 "@wordpress/url@^2.7.0":
-  version "2.7.0"
-  resolved "https://registry.yarnpkg.com/@wordpress/url/-/url-2.7.0.tgz#ebe933686618315e35a7e014a4052b157ac17424"
-  integrity sha512-W1KEyllal8YWbLMyqfbPw7pQzVsJh73RQyqElrPwZ84TPeH/1JilKVMgKb2RXgJw8q8I+gZIXi6GmVY0+WNAxg==
+  version "2.8.0"
+  resolved "https://registry.yarnpkg.com/@wordpress/url/-/url-2.8.0.tgz#4f0f862c8dc58c67797cef2c50144c52d29f6120"
+  integrity sha512-TsQzHr1T8nNX31cMWIdCwAZmL9rkiDX5bOfBmeihthrykb1DhcxXL9unrZvZ7mcosQ+tD8dKPcySi/e79hOFEA==
   dependencies:
     "@babel/runtime" "^7.4.4"
     qs "^6.5.2"