[build] Update shadow plugin (#7540)

build.gradle

@@ -18,7 +18,7 @@ plugins {
     id 'idea'
     id 'visual-studio'
     id 'net.ltgt.errorprone' version '3.1.0' apply false
-    id 'com.github.johnrengelman.shadow' version '8.1.1' apply false
+    id 'com.gradleup.shadow' version '8.3.4' apply false
     id 'com.diffplug.spotless' version '6.20.0' apply false
     id 'com.github.spotbugs' version '6.0.2' apply false
 }

cameraserver/multiCameraServer/build.gradle

@@ -22,7 +22,7 @@ application {
     mainClass = 'edu.wpi.Main'
 }
 
-apply plugin: 'com.github.johnrengelman.shadow'
+apply plugin: 'com.gradleup.shadow'
 
 repositories {
     maven {

developerRobot/build.gradle

@@ -35,7 +35,7 @@ application {
     mainClass = 'frc.robot.Main'
 }
 
-apply plugin: 'com.github.johnrengelman.shadow'
+apply plugin: 'com.gradleup.shadow'
 
 repositories {
     maven {

wpilibjIntegrationTests/build.gradle

@@ -15,7 +15,7 @@ application {
     mainClass = 'edu.wpi.first.wpilibj.test.AntJunitLauncher'
 }
 
-apply plugin: 'com.github.johnrengelman.shadow'
+apply plugin: 'com.gradleup.shadow'
 
 repositories {
     maven {