Bumped versions before the release

Author: marcingrzejszczak

pom.xml

@@ -29,7 +29,7 @@
 	<parent>
 		<groupId>org.springframework.cloud</groupId>
 		<artifactId>spring-cloud-build</artifactId>
-		<version>3.1.6-SNAPSHOT</version>
+		<version>3.1.5</version>
 		<relativePath/>
 		<!-- lookup parent from repository -->
 	</parent>

spring-cloud-sleuth-otel-dependencies/pom.xml

@@ -22,7 +22,7 @@
 	<parent>
 		<artifactId>spring-cloud-dependencies-parent</artifactId>
 		<groupId>org.springframework.cloud</groupId>
-		<version>3.1.0</version>
+		<version>3.1.5</version>
 		<relativePath/>
 	</parent>
 	<artifactId>spring-cloud-sleuth-otel-dependencies</artifactId>