Update okhttp3 in tests (and update Kotlin generally to do so)

Author: pimterry

build.gradle

@@ -10,7 +10,7 @@ buildscript {
 
 plugins {
     id 'java'
-    id 'org.jetbrains.kotlin.jvm' version '1.4.10'
+    id 'org.jetbrains.kotlin.jvm' version '1.6.21'
     id 'com.github.johnrengelman.shadow' version '6.1.0'
 }
 
@@ -116,7 +116,7 @@ tasks.register('r8Jar', JavaExec) { task ->
             '--classfile',
             '--output', r8File.toString(),
             '--pg-conf', rules.toString()
-    ] + (configurations.compileOnly.filter { path ->
+    ] + (configurations.compileClasspath.filter { path ->
         // Include libs for a few runtime-only deps, so R8 can resolve them during optimization:
         path.getName().startsWith("jna-") ||
         path.getName().startsWith("jetty-util-") ||

test-app/build.gradle

@@ -17,7 +17,7 @@ dependencies {
     implementation group: 'org.apache.httpcomponents.client5', name: 'httpclient5', version: '5.0.3'
     implementation group: 'org.apache.httpcomponents', name: 'httpasyncclient', version: '4.1.4'
 
-    implementation group: 'com.squareup.okhttp3', name: 'okhttp', version: '4.9.1'
+    implementation group: 'com.squareup.okhttp3', name: 'okhttp', version: '4.10.0'
     implementation group: 'com.squareup.okhttp', name: 'okhttp', version: '2.7.5'
     implementation group: 'com.squareup.retrofit2', name: 'retrofit', version: '2.9.0'