Update dependency org.mockito:mockito-core to v2.28.2 (#36)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -32,7 +32,7 @@
         <gherkin.version>18.1.1</gherkin.version>
         <groovy.version>2.4.12</groovy.version>
         <junit-jupiter.version>5.9.1</junit-jupiter.version>
-        <mockito.version>2.27.0</mockito.version>
+        <mockito.version>2.28.2</mockito.version>
         <project.Automatic-Module-Name>io.cucumber.groovy</project.Automatic-Module-Name>
     </properties>