MINOR: Remove unnecessary easymock/powermock dependencies (#15460)

These projects don't actually use easymock/powermock.

Reviewers: Chia-Ping Tsai <chia7712@gmail.com>
diff --git a/build.gradle b/build.gradle
index b362c2f..f2ba22e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -2183,8 +2183,6 @@
     testImplementation libs.junitJupiter
     testImplementation libs.junitVintageEngine
     testImplementation libs.easymock
-    testImplementation libs.powermockJunit4
-    testImplementation libs.powermockEasymock
     testImplementation libs.bcpkix
     testImplementation libs.hamcrest
     testImplementation libs.mockitoCore
@@ -2332,7 +2330,6 @@
     testImplementation project(':streams:test-utils')
 
     testImplementation libs.junitJupiter
-    testImplementation libs.easymock
     testImplementation libs.mockitoCore
     testImplementation libs.mockitoJunitJupiter // supports MockitoExtension
     testImplementation libs.hamcrest
@@ -2869,7 +2866,6 @@
 
     implementation libs.slf4jApi
 
-    testImplementation libs.easymock
     testImplementation libs.junitJupiter
 
     testRuntimeOnly libs.slf4jlog4j
@@ -2909,8 +2905,7 @@
     api libs.jacksonAfterburner
 
     implementation libs.slf4jApi
-
-    testImplementation libs.easymock
+    
     testImplementation libs.junitJupiter
 
     testRuntimeOnly libs.slf4jlog4j