Larger size limit for caching package listings (#3815)

lib/src/source/hosted.dart

diff --git a/lib/src/source/hosted.dart b/lib/src/source/hosted.dart
index d2928ae..53330fd 100644
--- a/lib/src/source/hosted.dart
+++ b/lib/src/source/hosted.dart
@@ -438,7 +438,7 @@
 
     // Cache the response on disk.
     // Don't cache overly big responses.
-    if (bodyText.length < 100 * 1024) {
+    if (bodyText.length < 500 * 1024) {
       await _cacheVersionListingResponse(body, ref, cache);
     }
     return result;