deps: bump io.github.goooler.shadow from 8.1.7 to 8.1.8 (#164)

Bumps [io.github.goooler.shadow](https://github.com/Goooler/shadow) from 8.1.7 to 8.1.8.
- [Release notes](https://github.com/Goooler/shadow/releases)
- [Commits](Goooler/shadow@v8.1.7...v8.1.8)

---
updated-dependencies:
- dependency-name: io.github.goooler.shadow
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -4,7 +4,7 @@ import java.text.SimpleDateFormat
 plugins {
     id 'checkstyle'
     id "com.github.spotbugs" version "6.0.19"
-    id 'io.github.goooler.shadow' version '8.1.7'
+    id 'io.github.goooler.shadow' version '8.1.8'
     id 'java'
 }