Bump com.github.johnrengelman.shadow from 7.1.2 to 8.1.0

Bumps com.github.johnrengelman.shadow from 7.1.2 to 8.1.0.

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

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

build.gradle.kts

@@ -7,7 +7,7 @@ import net.researchgate.release.ReleaseExtension
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 plugins {
-    id("com.github.johnrengelman.shadow") version "7.1.2"
+    id("com.github.johnrengelman.shadow") version "8.1.0"
     `java-library`
     `maven-publish`
     signing