Gh-10446: RedisLockRegistry stopRenew is not thread safe

Fixes: #10446

Signed-off-by: PiotrDuz <[email protected]>

(cherry picked from commit 17beaef)

Author: PiotrDuz

spring-integration-redis/src/main/java/org/springframework/integration/redis/util/RedisLockRegistry.java

@@ -599,8 +599,9 @@ protected final boolean renew() {
 		}
 
 		protected final void stopRenew() {
-			if (this.renewFuture != null) {
-				this.renewFuture.cancel(true);
+			ScheduledFuture<?> renewFutureToCancel = this.renewFuture;
+			if (renewFutureToCancel != null) {
+				renewFutureToCancel.cancel(true);
 				this.renewFuture = null;
 			}
 		}