GitHub: Renovate attempts to reopen deleted Dashboard issue

[rarkins]

Describe the proposed change(s).

Discussion: #32161

Workaround: change dependencyDashboardTitle

It would be good to strongly type Issue state to achieve this, e.g.

diff --git a/lib/modules/platform/types.ts b/lib/modules/platform/types.ts
index 91575d098..24eb42cba 100644
--- a/lib/modules/platform/types.ts
+++ b/lib/modules/platform/types.ts
@@ -87,13 +87,15 @@ export interface Pr {
   isDraft?: boolean;
 }
 
+export type IssueState = 'open' | 'closed' | 'deleted';
+
 /**
  * TODO: Proper typing
  */
 export interface Issue {
   body?: string;
   number?: number;
-  state?: string;
+  state?: IssueState;
   title?: string;
 }
 export type PlatformPrOptions = {