Update test deps for Java 11

Prevent bytecode generation related test failures in tests that rely on
PowerMock by updating to PowerMock 2.

gradle/properties.gradle

@@ -2,7 +2,7 @@ ext {
     kotlinVersion = '1.3.40'
     kotlinxCoroutinesVersion = '1.3.0-M2'
     junitVersion = '4.12'
-    powermockVersion = '1.6.4'
+    powermockVersion = '2.0.2'
     bouncycastleVersion = '1.54'
     c3p0Version = '0.9.5.2'
     scryptVersion = '1.4.0'

gradle/testing.gradle

@@ -10,7 +10,7 @@ gradle.projectsEvaluated {
         apply plugin: "jacoco"
 
         jacoco {
-            toolVersion = '0.8.1'
+            toolVersion = '0.8.4'
         }
 
         test {

gradle/wrapper.gradle

@@ -1,3 +1,3 @@
 wrapper {
-    gradleVersion = "4.9"
+    gradleVersion = "5.5"
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,6 @@
+#Tue Jul 16 03:37:52 BST 2019
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.5-all.zip