update dependencies, add shims for node-fetch v3

src/routes/getTotalStats.ts

@@ -45,7 +45,7 @@ export async function getTotalStats(req: Request, res: Response): Promise<void>
 function updateExtensionUsers() {
     if (config.userCounterURL) {
         fetch(`${config.userCounterURL}/api/v1/userCount`)
-            .then(res => res.json())
+            .then(res => res.json() as Record<string, any>)
             .then(data => {
                 apiUsersCache = Math.max(apiUsersCache, data.userCount);
             })
@@ -56,7 +56,7 @@ function updateExtensionUsers() {
     const chromeExtensionUrl = "https://chrome.google.com/webstore/detail/sponsorblock-for-youtube/mnjggcdmjocbbbhaepdhchncahnbgone";
 
     fetch(mozillaAddonsUrl)
-        .then(res => res.json())
+        .then(res => res.json() as Record<string, any>)
         .then(data => {
             firefoxUsersCache = data.average_daily_users;
             fetch(chromeExtensionUrl)