Build(deps): Bump com.github.johnrengelman.shadow from 7.1.2 to 8.1.1 (#333)

Bumps com.github.johnrengelman.shadow from 7.1.2 to 8.1.1.

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

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build.gradle

@@ -21,7 +21,7 @@ plugins {
     id "com.diffplug.spotless" version "6.12.1" apply false
     id "org.nosphere.apache.rat" version "0.8.1"
     id "com.github.maiflai.scalatest" version "0.32" apply false
-    id "com.github.johnrengelman.shadow" version "7.1.2" apply false
+    id "com.github.johnrengelman.shadow" version "8.1.1" apply false
 }
 
 project.ext {