Lower min capacity so the test succeeds when ulimit -l has a lower value

Summary: Lower min capacity so the test succeeds when ulimit -l has a lower value

Reviewed By: yfeldblum

Differential Revision: D26321362

fbshipit-source-id: 9d2c41fbbc190f46a6174c3f847943e13f5bea6c

folly/experimental/io/test/IoUringBackendTest.cpp

@@ -495,7 +495,7 @@ TEST(IoUringBackend, SuccessCreateRetry) {
   try {
     folly::IoUringBackend::Options options;
     options.setCapacity(256 * 1024);
-    options.setMinCapacity(1024);
+    options.setMinCapacity(16);
     folly::IoUringBackend backend(options);
   } catch (const folly::IoUringBackend::NotAvailable&) {
     bSuccess = false;