Fix flaky DefaultPoolTest

The `claimWhenInterruptedMustNotThrowIfObjectIsAvailableViaCache` relies on the thread-local cache having a previously claimed object ready to be reclaimed.
However, background expiration checking would sometimes race and claim the object temporarily, preventing a TLR_CLAIM by the test.
This would cause the test to go down the slow claim path, which is susceptible to interrupts, and which the test was asserting would not happen.

src/test/java/blackbox/DefaultPoolTest.java

@@ -25,4 +25,10 @@ class DefaultPoolTest extends ThreadBasedPoolTest {
   protected PoolBuilder<GenericPoolable> createInitialPoolBuilder(AlloKit.CountingAllocator allocator) {
     return Pool.from(allocator);
   }
+
+  @Override
+  void claimWhenInterruptedMustNotThrowIfObjectIsAvailableViaCache(Taps taps) throws Exception {
+    noBackgroundExpirationChecking(); // Prevent background expiration checking from claiming cached object.
+    super.claimWhenInterruptedMustNotThrowIfObjectIsAvailableViaCache(taps);
+  }
 }