Bump microsphere-spring-boot.version to 0.2.15

Update the parent POM property microsphere-spring-boot.version from 0.2.14 to 0.2.15 to pick up the latest microsphere-spring-boot fixes/updates.

Author: mercyblitz

microsphere-spring-cloud-parent/pom.xml

@@ -20,7 +20,7 @@
 
     <properties>
         <!-- BOM versions -->
-        <microsphere-spring-boot.version>0.2.14</microsphere-spring-boot.version>
+        <microsphere-spring-boot.version>0.2.15</microsphere-spring-boot.version>
         <testcontainers.version>2.0.5</testcontainers.version>
         <!-- Testing -->
         <junit-jupiter.version>6.1.0</junit-jupiter.version>