fix(deps): update dependency org.springframework.boot:spring-boot-starter-parent to v2.3.12.release

Author: mend-for-github-com[bot]

test-app/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.3.5.RELEASE</version>
+        <version>2.3.12.RELEASE</version>
         <relativePath/>
     </parent>