Start building against Spring Pulsar 1.2.0 snapshots

See gh-42147

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapper.java

@@ -199,6 +199,7 @@ final class PulsarPropertiesMapper {
 		map.from(properties::isObservationEnabled).to(containerProperties::setObservationEnabled);
 	}
 
+	@SuppressWarnings("removal")
 	<T> void customizeConcurrentPulsarListenerContainerFactory(
 			ConcurrentPulsarListenerContainerFactory<T> listenerContainerFactory) {
 		PulsarProperties.Listener properties = this.properties.getListener();

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/pulsar/PulsarPropertiesMapperTests.java

@@ -274,6 +274,7 @@ class PulsarPropertiesMapperTests {
 	}
 
 	@Test
+	@SuppressWarnings("removal")
 	void customizeConcurrentPulsarListenerContainerFactory() {
 		PulsarProperties properties = new PulsarProperties();
 		properties.getListener().setConcurrency(10);

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -2051,7 +2051,7 @@ bom {
 			releaseNotes("https://github.com/spring-projects/spring-ldap/releases/tag/{version}")
 		}
 	}
-	library("Spring Pulsar", "1.2.0-M1") {
+	library("Spring Pulsar", "1.2.0-SNAPSHOT") {
 		considerSnapshots()
 		group("org.springframework.pulsar") {
 			imports = [