chore: rebuild fixtures (#8995)

Rebuilds the fixtures for the e2e synching test. Something seem to have
become slower, as I needed to bump the timeout to actually build them 😭.

Author: LHerskind

yarn-project/end-to-end/src/e2e_synching.test.ts

@@ -381,7 +381,7 @@ describe('e2e_synching', () => {
       await variant.writeBlocks(blocks);
       await teardown();
     },
-    1_200_000,
+    2_400_000,
   );
 
   const testTheVariant = async (