Build: Bump io.github.goooler.shadow:shadow-gradle-plugin (#10612)

Bumps [io.github.goooler.shadow:shadow-gradle-plugin](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:shadow-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -26,7 +26,7 @@ buildscript {
     gradlePluginPortal()
   }
   dependencies {
-    classpath 'io.github.goooler.shadow:shadow-gradle-plugin:8.1.7'
+    classpath 'io.github.goooler.shadow:shadow-gradle-plugin:8.1.8'
     classpath 'com.palantir.baseline:gradle-baseline-java:4.42.0'
     // com.palantir.baseline:gradle-baseline-java:4.42.0 (the last version supporting Java 8) pulls
     // in an old version of the errorprone, which doesn't work w/ Gradle 8, so bump errorpone as