Reset thread's interrupted flag when catching InterruptedException

Closes gh-6360

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/StartMojo.java

@@ -167,6 +167,7 @@ public class StartMojo extends AbstractRunMojo {
 					this.lock.wait(wait);
 				}
 				catch (InterruptedException ex) {
+					Thread.currentThread().interrupt();
 					throw new IllegalStateException(
 							"Interrupted while waiting for Spring Boot app to start.");
 				}
@@ -275,6 +276,7 @@ public class StartMojo extends AbstractRunMojo {
 					this.lock.wait(wait);
 				}
 				catch (InterruptedException ex) {
+					Thread.currentThread().interrupt();
 					throw new IllegalStateException(
 							"Interrupted while waiting for Spring Boot app to start.");
 				}