fix(ci): fix eslint compatibility, downgrade to v8, and fix lint errors

lib/services/cache/memory-cache-service.ts

@@ -1,7 +1,7 @@
 import type { CacheService } from "./cache-service";
 
 export class MemoryCacheService implements CacheService {
-  private cache = new Map<string, { value: any; expiry: number | null }>();
+  private cache = new Map<string, { value: unknown; expiry: number | null }>();
 
   async get<T>(key: string): Promise<T | null> {
     const item = this.cache.get(key);