Upgrade to Pulsar Reactive 0.4.0

This commit updates the Reactive client used by Spring Pulsar to
version 0.4.0. The updated client fixes an issue where the
non-reactive and reactive shaded producer cache had the same
relocation prefix. This allows the removal of the shaded
relocation prefixes from the checkRuntimeClasspathForConflicts
ignore closure.

See gh-37801

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

@@ -1218,7 +1218,7 @@ bom {
 			]
 		}
 	}
-	library("Pulsar Reactive", "0.3.0") {
+	library("Pulsar Reactive", "0.4.0") {
 		group("org.apache.pulsar") {
 			modules = [
 				"pulsar-client-reactive-adapter",

spring-boot-project/spring-boot-starters/spring-boot-starter-pulsar-reactive/build.gradle

@@ -11,9 +11,6 @@ dependencies {
 
 checkRuntimeClasspathForConflicts {
 	ignore { name -> name.startsWith("org/bouncycastle/") ||
-				name.matches("^org\\/apache\\/pulsar\\/.*\\/package-info.class\$") ||
+			name.matches("^org\\/apache\\/pulsar\\/.*\\/package-info.class\$") ||
-				name.equals("findbugsExclude.xml") ||
+			name.equals("findbugsExclude.xml") }
-				name.startsWith("org/springframework/pulsar/shade/com/github/benmanes/caffeine/") ||
-				name.startsWith("org/springframework/pulsar/shade/com/google/errorprone/") ||
-				name.startsWith("org/springframework/pulsar/shade/org/checkerframework/") }
 }