Update plugin buildconfig to v5

Author: renovate[bot]

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ kotlinpoet = "2.1.0"
 ksp = "2.1.10-1.0.29"
 
 [plugins]
-buildconfig = { id = "com.github.gmazzo.buildconfig", version = "3.1.0" }
+buildconfig = { id = "com.github.gmazzo.buildconfig", version = "5.6.1" }
 kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
 dokka = { id = "org.jetbrains.dokka", version = "2.0.0-Beta" }
 ksp = { id = "com.google.devtools.ksp", version.ref = "ksp" }