Update dependency org.springframework.boot:spring-boot-dependencies to v2.7.15

Author: renovate[bot]

pom.xml

@@ -14,7 +14,7 @@
 	<properties>
 		<java.version>11</java.version>
 		<camel.version>3.19.0</camel.version>
-		<spring.boot-version>2.7.6</spring.boot-version>
+		<spring.boot-version>2.7.15</spring.boot-version>
 
 		<maven.compiler.source>1.8</maven.compiler.source>
 		<maven.compiler.target>1.8</maven.compiler.target>