Bump springboot.version from 3.1.1 to 3.1.2 (#613)

Author: dependabot[bot]

examples/springboot/pom.xml

@@ -19,7 +19,7 @@
     <maven.compiler.target>17</maven.compiler.target>
     <maven.compiler.source>17</maven.compiler.source>
     <thymeleaf.security.version>3.1.1.RELEASE</thymeleaf.security.version>
-    <springboot.version>3.1.1</springboot.version>
+    <springboot.version>3.1.2</springboot.version>
   </properties>
 
   <dependencyManagement>