Add `Name` field to `CreateForkOption` (#576)

- As per #558, due https://github.com/go-gitea/gitea/pull/18066

Co-authored-by: Andrew Thornton <art27@cantab.net>
Reviewed-on: https://gitea.com/gitea/go-sdk/pulls/576
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Andrew Thornton <art27@cantab.net>
Reviewed-by: John Olheiser <john.olheiser@gmail.com>
Co-authored-by: Gusted <williamzijl7@hotmail.com>
Co-committed-by: Gusted <williamzijl7@hotmail.com>

gitea/fork.go

@@ -32,6 +32,8 @@ func (c *Client) ListForks(user string, repo string, opt ListForksOptions) ([]*R
 type CreateForkOption struct {
 	// organization name, if forking into an organization
 	Organization *string `json:"organization"`
+	// name of the forked repository
+	Name *string `json:"name"`
 }
 
 // CreateFork create a fork of a repository