Review fixes for spring-scheduling-3.1:javaagent (open-telemetry#17740)

Co-authored-by: otelbot <197425009+otelbot@users.noreply.github.com>

Author: otelbot[bot]

instrumentation/spring/spring-scheduling-3.1/javaagent/src/test/java/io/opentelemetry/javaagent/instrumentation/spring/scheduling/v3_1/SpringSchedulingTest.java

@@ -47,7 +47,7 @@ class SpringSchedulingTest {
   @RegisterExtension
   private static final InstrumentationExtension testing = AgentInstrumentationExtension.create();
 
-  @RegisterExtension final AutoCleanupExtension cleanup = AutoCleanupExtension.create();
+  @RegisterExtension static final AutoCleanupExtension cleanup = AutoCleanupExtension.create();
 
   @Test
   void scheduleOneTimeTest() throws InterruptedException {