Bump com.github.gmazzo.buildconfig from 5.6.2 to 5.6.8

Bumps [com.github.gmazzo.buildconfig](https://github.com/gmazzo/gradle-buildconfig-plugin) from 5.6.2 to 5.6.8.
- [Release notes](https://github.com/gmazzo/gradle-buildconfig-plugin/releases)
- [Commits](gmazzo/gradle-buildconfig-plugin@v5.6.2...v5.6.8)

---
updated-dependencies:
- dependency-name: com.github.gmazzo.buildconfig
  dependency-version: 5.6.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

client/build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
     id("java-library")
     id("org.openapi.generator") version "7.5.0"
     id("org.kordamp.gradle.jandex") version "2.0.0"
-    id("com.github.gmazzo.buildconfig") version "5.6.2"
+    id("com.github.gmazzo.buildconfig") version "5.6.8"
     id("net.thebugmc.gradle.sonatype-central-portal-publisher") version "1.2.4"
 }