Upgrade to Gradle 8

This commit upgrades the build to use Gradle 8.0.2 and Dokka 1.8.10.

Closes gh-30000

build.gradle

@@ -3,7 +3,7 @@ plugins {
 	id 'io.freefair.aspectj' version '6.5.0.3' apply false
 	// kotlinVersion is managed in gradle.properties
 	id 'org.jetbrains.kotlin.plugin.serialization' version "${kotlinVersion}" apply false
-	id 'org.jetbrains.dokka' version '1.7.20'
+	id 'org.jetbrains.dokka' version '1.8.10'
 	id 'org.asciidoctor.jvm.convert' version '3.3.2' apply false
 	id 'org.asciidoctor.jvm.pdf' version '3.3.2'  apply false
 	id 'org.unbroken-dome.xjc' version '2.0.0' apply false

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.0.2-bin.zip
 networkTimeout=10000
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists