Upgrade Spring 6.1.14 -> 6.1.15

See:
- https://github.com/spring-projects/spring-framework/releases/tag/v6.1.15

pom.xml

@@ -508,7 +508,7 @@
             <dependency>
                 <groupId>org.springframework</groupId>
                 <artifactId>spring-framework-bom</artifactId>
-                <version>6.1.14</version>
+                <version>6.1.15</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>