Bump mockitoVersion from 5.0.0 to 5.1.1 in /Plan (#2854)

Bumps `mockitoVersion` from 5.0.0 to 5.1.1.

Updates `org.mockito:mockito-core` from 5.0.0 to 5.1.1
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](https://github.com/mockito/mockito/compare/v5.0.0...v5.1.1)

Updates `org.mockito:mockito-junit-jupiter` from 5.0.0 to 5.1.1
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](https://github.com/mockito/mockito/compare/v5.0.0...v5.1.1)

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

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

Plan/build.gradle

@@ -101,7 +101,7 @@ subprojects {
         nkPlaceholderapiVersion = "1.4-SNAPSHOT"
 
         junitVersion = "5.9.2"
-        mockitoVersion = "5.0.0"
+        mockitoVersion = "5.1.1"
         testContainersVersion = "1.17.6"
         swaggerVersion = "2.2.8"
     }