test: increase limit again for network space overhead test

On certain platforms, updating V8 to 7.9 made the numbers a bit higher
than the current limit.

Backport-PR-URL: #30513
PR-URL: #30020
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

test/sequential/test-net-bytes-per-incoming-chunk-overhead.js

@@ -37,5 +37,5 @@ process.on('exit', () => {
   const bytesPerChunk =
     (process.memoryUsage().rss - baseRSS) / receivedChunks.length;
   // We should always have less than one page (usually ~ 4 kB) per chunk.
-  assert(bytesPerChunk < 600, `measured ${bytesPerChunk} bytes per chunk`);
+  assert(bytesPerChunk < 650, `measured ${bytesPerChunk} bytes per chunk`);
 });