Bump powermock-core from 1.6.2 to 2.0.4

Bumps [powermock-core](https://github.com/powermock/powermock) from 1.6.2 to 2.0.4.
- [Release notes](https://github.com/powermock/powermock/releases)
- [Changelog](https://github.com/powermock/powermock/blob/release/2.x/docs/changelog.txt)
- [Commits](powermock/powermock@powermock-1.6.2...powermock-2.0.4)

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

build.gradle

@@ -39,7 +39,7 @@ dependencies {
     testImplementation files('libs/java-json.jar')
     testImplementation 'org.powermock:powermock-module-junit4:1.6.2'
     testImplementation 'org.powermock:powermock-api-mockito:1.6.2'
-    testImplementation 'org.powermock:powermock-core:1.6.2'
+    testImplementation 'org.powermock:powermock-core:2.0.4'
 
     api 'com.foursquare:pilgrimsdk:2.1.2'
 }