switch to Groovy DSL

gradle.properties

@@ -1,8 +1,10 @@
-junit.version=5.6.2
-lombok.version=1.18.16
-jna.version=5.5.0
-kotlin.version=1.3.70
-jcommander.version=1.78
-slf4j.version=1.7.30
-log4j.version=2.13.2
-net.woggioni.plugins.version=0.1
+jzstd.version = 0.1
+gradle.version = 7.1
+kotlin.version = 1.5.20
+junit.version = 5.6.2
+lombok.version = 1.18.16
+jna.version = 5.5.0
+jcommander.version = 1.78
+slf4j.version = 1.7.30
+log4j.version = 2.13.2
+net.woggioni.plugins.version = 0.1