Bump mockito-core from 3.3.3 to 3.6.28

Bumps [mockito-core](https://github.com/mockito/mockito) from 3.3.3 to 3.6.28.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v3.3.3...v3.6.28)

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

Author: dependabot-preview[bot]

browserup-proxy-core/build.gradle

@@ -95,7 +95,7 @@ dependencies {
     testImplementation 'org.hamcrest:hamcrest:2.2'
     testImplementation 'org.hamcrest:hamcrest-library:2.2'
     testImplementation 'com.github.tomakehurst:wiremock-jre8:2.26.3'
-    testImplementation 'org.mockito:mockito-core:3.3.3'
+    testImplementation 'org.mockito:mockito-core:3.6.28'
     testImplementation 'org.seleniumhq.selenium:selenium-firefox-driver:3.141.59'
     testImplementation 'org.apache.httpcomponents:httpclient:4.5.13'
 }

browserup-proxy-mitm/build.gradle

@@ -83,5 +83,5 @@ dependencies {
     testImplementation 'org.codehaus.groovy:groovy-all:3.0.7'
     testImplementation 'org.hamcrest:hamcrest:2.2'
     testImplementation 'org.hamcrest:hamcrest-library:2.2'
-    testImplementation 'org.mockito:mockito-core:3.3.3'
+    testImplementation 'org.mockito:mockito-core:3.6.28'
 }

browserup-proxy-rest/build.gradle

@@ -100,7 +100,7 @@ dependencies {
     testImplementation 'org.codehaus.groovy.modules.http-builder:http-builder:0.7.2'
     testImplementation 'org.hamcrest:hamcrest:2.2'
     testImplementation 'org.hamcrest:hamcrest-library:2.2'
-    testImplementation 'org.mockito:mockito-core:3.3.3'
+    testImplementation 'org.mockito:mockito-core:3.6.28'
     testImplementation 'org.seleniumhq.selenium:selenium-api:3.4.0'
     testImplementation 'org.awaitility:awaitility:4.0.2'
     testImplementation 'com.github.tomakehurst:wiremock-jre8:2.24.1'