Add HTTPS entries for XSD into spring.schemas

Related to spring-projects/spring-integration#2987

**Cherry-pick to 3.1.x, 3.0.x & 2.3.x**

Author: artembilan

src/main/resources/META-INF/spring.schemas

@@ -1,2 +1,4 @@
 http\://www.springframework.org/schema/integration/kafka/spring-integration-kafka-2.3.xsd=org/springframework/integration/kafka/config/spring-integration-kafka-2.3.xsd
 http\://www.springframework.org/schema/integration/kafka/spring-integration-kafka.xsd=org/springframework/integration/kafka/config/spring-integration-kafka-2.3.xsd
+https\://www.springframework.org/schema/integration/kafka/spring-integration-kafka-2.3.xsd=org/springframework/integration/kafka/config/spring-integration-kafka-2.3.xsd
+https\://www.springframework.org/schema/integration/kafka/spring-integration-kafka.xsd=org/springframework/integration/kafka/config/spring-integration-kafka-2.3.xsd