Ignore file order in test assertion (#1755)

This unit test asserts that a SHA file for a groovy dependency gets
created. However, a SHA file for javaparser-core also gets created in
the same directory. For some reason, builds were failing on my machine
because `Files::list` was returning the javaparser-core file first. I
don't believe there are any ordering guarantees with that API, so I
relaxed the assertion to not depend on ordering.

Signed-off-by: Andrew Ross <andrross@amazon.com>

buildSrc/src/test/java/org/opensearch/gradle/precommit/UpdateShasTaskTests.java

@@ -91,9 +91,10 @@ public class UpdateShasTaskTests extends GradleUnitTestCase {
         getLicensesDir(project).mkdir();
         task.updateShas();
 
-        Path groovySha = Files.list(getLicensesDir(project).toPath()).findFirst().get();
-
-        assertTrue(groovySha.toFile().getName().startsWith("groovy-"));
+        assertTrue(
+            "Expected a sha file to exist with a name prefix of 'groovy-",
+            Files.list(getLicensesDir(project).toPath()).anyMatch(sha -> sha.toFile().getName().startsWith("groovy-"))
+        );
     }
 
     @Test