Bump com.github.johnrengelman.shadow in /serverless-ui/jwt-stack

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

---
updated-dependencies:
- dependency-name: com.github.johnrengelman.shadow
  dependency-version: 8.1.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

serverless-ui/jwt-stack/build.gradle.kts

@@ -13,7 +13,7 @@ plugins {
     id("war")
 
     // Creates fat JAR
-    id("com.github.johnrengelman.shadow") version "7.1.2"
+    id("com.github.johnrengelman.shadow") version "8.1.1"
 
     id("org.wisepersist.gwt") version "1.1.19"
     id("org.gretty") version "4.0.3"