Update dependency com.gradleup.shadow:shadow-gradle-plugin to v8.3.8 (#3225)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

buildSrc/build.gradle.kts

@@ -23,7 +23,7 @@ val properties = Properties().also { props ->
 dependencies {
     implementation(gradleApi())
     implementation("org.ajoberstar.grgit:grgit-gradle:5.3.2")
-    implementation("com.gradleup.shadow:shadow-gradle-plugin:8.3.6")
+    implementation("com.gradleup.shadow:shadow-gradle-plugin:8.3.8")
     implementation("io.papermc.paperweight.userdev:io.papermc.paperweight.userdev.gradle.plugin:2.0.0-SNAPSHOT")
     constraints {
         val asmVersion = "[9.7,)"