test(api-keys): improve typings in wrapWithThen mock implementation

backend/src/api-keys/repositories/api-keys.repository.spec.ts

@@ -19,11 +19,11 @@ describe("ApiKeysRepository", () => {
 		execute: jest.fn(),
 	};
 
-	const wrapWithThen = (obj: any) => {
+	const wrapWithThen = (obj: unknown) => {
 		// biome-ignore lint/suspicious/noThenProperty: Necessary to mock Drizzle's awaitable query builder
 		Object.defineProperty(obj, "then", {
-			value: function (onFulfilled: any) {
-				const result = this.execute();
+			value: function (onFulfilled: (arg0: unknown) => void) {
+				const result = (this as any).execute();
 				return Promise.resolve(result).then(onFulfilled);
 			},
 			configurable: true,