Bump microsphere BOM to 0.3.1

Update `microsphere-java-parent/pom.xml` to use `microsphere-bom.version` 0.3.1, aligning the parent dependency management with the latest BOM release.

Author: mercyblitz

microsphere-java-parent/pom.xml

@@ -19,7 +19,7 @@
     <description>Microsphere Java Parent</description>
 
     <properties>
-        <microsphere-bom.version>0.3.0</microsphere-bom.version>
+        <microsphere-bom.version>0.3.1</microsphere-bom.version>
         <spring-framework.version>7.0.8</spring-framework.version>
     </properties>