build(deps): bump org.mockito:mockito-core from 5.15.2 to 5.20.0

Bumps [org.mockito:mockito-core](https://github.com/mockito/mockito) from 5.15.2 to 5.20.0.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v5.15.2...v5.20.0)

---
updated-dependencies:
- dependency-name: org.mockito:mockito-core
  dependency-version: 5.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

build.gradle

@@ -52,7 +52,7 @@ dependencies {
     implementation "org.antlr:antlr4-intellij-adaptor:0.1"
     implementation group: 'org.jfree', name: 'org.jfree.svg', version: '5.0.6'
     testImplementation group: 'junit', name: 'junit', version: '4.13.2'
-    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.15.2'
+    testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.20.0'
 }
 
 generateGrammarSource {