Removed the use of any and enabled the rule in eslint.

Now according to me the conversion is final.
Testing is required.

overlord/src/app/issue/issue-grid-datasource.ts

@@ -1,12 +1,14 @@
 import { DataSource } from '@angular/cdk/collections';
 import { Observable } from 'rxjs';
 
-export class IssueGridDataSource extends DataSource<any> {
-  constructor(private data: Observable<any[]>) {
+import { IssueGridItem } from '../core/issue-grid-item';
+
+export class IssueGridDataSource extends DataSource<IssueGridItem> {
+  constructor(private data: Observable<IssueGridItem[]>) {
     super();
   }
 
-  connect(): Observable<any[]> {
+  connect(): Observable<IssueGridItem[]> {
     return this.data;
   }