Bump org.mockito:mockito-core from 5.20.0 to 5.21.0

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.20.0 to 5.21.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.20.0...v5.21.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-version: 5.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

assertj-mail-jakarta/pom.xml

@@ -100,7 +100,7 @@
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>5.20.0</version>
+      <version>5.21.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>

assertj-mail/pom.xml

@@ -100,7 +100,7 @@
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>5.20.0</version>
+      <version>5.21.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>

examples-jakarta/pom.xml

@@ -52,7 +52,7 @@
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>5.20.0</version>
+      <version>5.21.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>

examples/pom.xml

@@ -52,7 +52,7 @@
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>5.20.0</version>
+      <version>5.21.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>