Bump com.gradleup.shadow:shadow-gradle-plugin from 8.3.8 to 8.3.9

Bumps [com.gradleup.shadow:shadow-gradle-plugin](https://github.com/GradleUp/shadow) from 8.3.8 to 8.3.9.
- [Release notes](https://github.com/GradleUp/shadow/releases)
- [Commits](GradleUp/shadow@8.3.8...8.3.9)

---
updated-dependencies:
- dependency-name: com.gradleup.shadow:shadow-gradle-plugin
  dependency-version: 8.3.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

buildSrc/build.gradle.kts

@@ -32,7 +32,7 @@ dependencies {
   // When updating, update above in plugins too
   implementation("com.diffplug.spotless:spotless-plugin-gradle:7.2.1")
   implementation("com.github.spotbugs.snom:spotbugs-gradle-plugin:6.2.3")
-  implementation("com.gradleup.shadow:shadow-gradle-plugin:8.3.8")
+  implementation("com.gradleup.shadow:shadow-gradle-plugin:8.3.9")
 
   implementation("org.owasp:dependency-check-gradle:12.1.3")