Bump hibernate-core from 5.4.20.Final to 5.4.21.Final (micronaut-projects#4002)

Bumps [hibernate-core](https://github.com/hibernate/hibernate-orm) from 5.4.20.Final to 5.4.21.Final.
- [Release notes](https://github.com/hibernate/hibernate-orm/releases)
- [Changelog](https://github.com/hibernate/hibernate-orm/blob/5.4.21/changelog.txt)
- [Commits](hibernate/hibernate-orm@5.4.20...5.4.21)

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Author: dependabot[bot]

inject-groovy/build.gradle

@@ -4,7 +4,7 @@ dependencies {
     api dependencyModuleVersion("groovy", "groovy")
 
 //    testImplementation 'javax.validation:validation-api:1.1.0.Final'
-    testImplementation "org.hibernate:hibernate-core:5.4.20.Final"
+    testImplementation "org.hibernate:hibernate-core:5.4.21.Final"
     testImplementation 'org.hibernate:hibernate-validator:6.1.5.Final'
     testRuntimeOnly 'org.glassfish.web:el-impl:2.2.1-b05'
     testRuntimeOnly 'org.glassfish:javax.el:3.0.1-b11'

inject-java/build.gradle

@@ -12,7 +12,7 @@ dependencies {
     testAnnotationProcessor project(":inject-java")
     testImplementation project(":runtime")
     testImplementation dependencyVersion("rxjava2")
-    testImplementation "org.hibernate:hibernate-core:5.4.20.Final"
+    testImplementation "org.hibernate:hibernate-core:5.4.21.Final"
     testImplementation "junit:junit:4.13"
     testImplementation "com.google.testing.compile:compile-testing:0.18"
     testImplementation 'org.mongodb:mongo-java-driver:3.12.7'