Update USER_AGENT to Firefox 140 ESR

Author: TobiGr

app/src/main/java/org/schabi/newpipe/DownloaderImpl.java

@@ -29,7 +29,7 @@
 
 public final class DownloaderImpl extends Downloader {
     public static final String USER_AGENT =
-            "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0";
+            "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:140.0) Gecko/20100101 Firefox/140.0";
     public static final String YOUTUBE_RESTRICTED_MODE_COOKIE_KEY =
             "youtube_restricted_mode_key";
     public static final String YOUTUBE_RESTRICTED_MODE_COOKIE = "PREF=f2=8000000";