Bump com.gradleup.shadow from 8.3.8 to 9.4.1 (#566)

Bumps [com.gradleup.shadow](https://github.com/GradleUp/shadow) from 8.3.8 to 9.4.1.
- [Release notes](https://github.com/GradleUp/shadow/releases)
- [Commits](https://github.com/GradleUp/shadow/compare/8.3.8...9.4.1)

---
updated-dependencies:
- dependency-name: com.gradleup.shadow
  dependency-version: 9.4.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ pluginyml = "0.6.0"
 
 [plugins]
 indra-git = "net.kyori.indra.git:3.2.0"
-shadow = "com.gradleup.shadow:8.3.8"
+shadow = "com.gradleup.shadow:9.4.1"
 spotless = "com.diffplug.spotless:8.4.0"
 pluginyml-bungee = { id = "net.minecrell.plugin-yml.bungee", version.ref = "pluginyml" }
 pluginyml-bukkit = { id = "net.minecrell.plugin-yml.bukkit", version.ref = "pluginyml" }