gradle: bump com.gradleup.shadow in /client-samples/java/rest

Bumps [com.gradleup.shadow](https://github.com/GradleUp/shadow) from 8.3.5 to 8.3.6.
- [Release notes](https://github.com/GradleUp/shadow/releases)
- [Commits](GradleUp/shadow@8.3.5...8.3.6)

---
updated-dependencies:
- dependency-name: com.gradleup.shadow
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

client-samples/java/rest/build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
     id("java")
-    id("com.gradleup.shadow") version "8.3.5"
+    id("com.gradleup.shadow") version "8.3.6"
 }
 
 group = "example.application"