Update dependency org.springframework.shell:spring-shell-starter to v2.1.15

Author: renovate[bot]

spring-shell-port-scanner/pom.xml

@@ -28,7 +28,7 @@
 		<dependency>
 			<groupId>org.springframework.shell</groupId>
 			<artifactId>spring-shell-starter</artifactId>
-			<version>2.0.1.RELEASE</version>
+			<version>2.1.15</version>
 		</dependency>
 
 		<dependency>