binderRpcTest: reduce thread pool saturated flake

Limit one of the checks here since we tightened timings
around it.

Fixes: 278414056
Test: N/A
Change-Id: I9a86ef09784dd093e4ffd45c91892bb5788ab2a5
diff --git a/libs/binder/tests/binderRpcTest.cpp b/libs/binder/tests/binderRpcTest.cpp
index 8d13007..287e077 100644
--- a/libs/binder/tests/binderRpcTest.cpp
+++ b/libs/binder/tests/binderRpcTest.cpp
@@ -462,7 +462,7 @@
     EXPECT_GE(epochMsAfter, epochMsBefore + 2 * sleepMs);
 
     // Potential flake, but make sure calls are handled in parallel.
-    EXPECT_LE(epochMsAfter, epochMsBefore + 3 * sleepMs);
+    EXPECT_LE(epochMsAfter, epochMsBefore + 4 * sleepMs);
 }
 
 TEST_P(BinderRpc, ThreadPoolOverSaturated) {