https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9908#note_25331127

Closes #29106

Signed-off-by: Rémy Coutable <remy@rymai.me>

[ci skip]

[ci skip]

See if we can reproduce that problem

Signed-off-by: Rémy Coutable <remy@rymai.me>

Given that the 9.0 release of GitLab will mark the end of the support
for Ruby 2.1, we can stop testing against Ruby 2.1.

Fixes #27251

[ci skip]

Ruby 2.3:
```
URI.parse('http://foo/bar?baz quux')
=> #<URI::HTTP http://foo/bar?baz%20quux>
```

Ruby 2.1:
```
URI.parse('http://foo/bar?baz quux')
URI::InvalidURIError: bad URI(is not URI?): http://foo/bar?baz quux
```