BREAKING CHANGE: ActionsService.CreateHostedRunner and EnterpriseService.CreateHostedRunner now accept CreateHostedRunnerRequest; ActionsService.UpdateHostedRunner and EnterpriseService.UpdateHostedRunner now accept UpdateHostedRunnerRequest.

While working on #3972, I found that ActionsService.UpdateHostedRunner accepts HostedRunnerRequest as a body. But it's wrong according to the docs for actions and enterprise.

Current:

type HostedRunnerRequest struct {
	Name           string            `json:"name,omitempty"`
	Image          HostedRunnerImage `json:"image,omitempty"`
	RunnerGroupID  int64             `json:"runner_group_id,omitempty"`
	Size           string            `json:"size,omitempty"`
	MaximumRunners int64             `json:"maximum_runners,omitempty"`
	EnableStaticIP bool              `json:"enable_static_ip,omitempty"`
	ImageVersion   string            `json:"image_version,omitempty"`
}

Should be image_id (optional) instead of the Image. So, I created a separate struct UpdateHostedRunnerRequest with an optional image_id and the rest of the fields (all optional).