Bump com.gradleup.shadow:shadow-gradle-plugin from 8.3.8 to 9.3.1

Bumps [com.gradleup.shadow:shadow-gradle-plugin](https://github.com/GradleUp/shadow) from 8.3.8 to 9.3.1.
- [Release notes](https://github.com/GradleUp/shadow/releases)
- [Commits](GradleUp/shadow@8.3.8...9.3.1)

---
updated-dependencies:
- dependency-name: com.gradleup.shadow:shadow-gradle-plugin
  dependency-version: 9.3.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

buildSrc/build.gradle.kts

@@ -41,7 +41,7 @@ repositories {
 dependencies {
   implementation(gradleApi())
   implementation(localGroovy())
-  implementation("com.gradleup.shadow:shadow-gradle-plugin:8.3.8") {                   // Enable shading Java dependencies
+  implementation("com.gradleup.shadow:shadow-gradle-plugin:9.3.1") {                   // Enable shading Java dependencies
     exclude(group="org.codehaus.plexus", module="plexus-xml") // plexus-xml 4.x requires Java17
   }
   runtimeOnly("org.codehaus.plexus:plexus-xml:3.0.2")