Update dependency org.junit:junit-bom to v5.12.1

Author: renovate[bot]

build.gradle

@@ -14,7 +14,7 @@ subprojects {
     apply plugin: 'io.spring.dependency-management'
 
     dependencies {
-        testImplementation platform('org.junit:junit-bom:5.11.1')
+        testImplementation platform('org.junit:junit-bom:5.12.1')
         testImplementation 'org.junit.jupiter:junit-jupiter'
         testImplementation 'org.springframework.boot:spring-boot-starter-test'