Bump org.mockito:mockito-core from 5.20.0 to 5.21.0 (#493)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

examples/fabric-contract-example-maven/pom.xml

@@ -93,7 +93,7 @@
 <dependency>
     <groupId>org.mockito</groupId>
     <artifactId>mockito-core</artifactId>
-    <version>5.20.0</version>
+    <version>5.21.0</version>
 </dependency>
 
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