fix(response-modifier): add explicit any type

The Typescript compiler would sometimes complain that `res` had
implicitly the `any` type. This commit fixes this issue.

Change-Id: Ic18492928ad3c828353511c3fddef7b89efd118c

src/xhrInterceptor/responseModifiers/loadMoreThread.ts

@@ -123,7 +123,7 @@ async function loadGap(
     },
     /* authenticated = */ true,
     authuser,
-  ).then((res) => {
+  ).then((res: any) => {
     const thread = new ThreadModel(res[1]);
     return thread.getMessageOrGapModels();
   });