fix(deps): pin dependencies (#8)

Co-authored-by: figure-renovate[bot] <108099378+figure-renovate[bot]@users.noreply.github.com>

Author: figure-renovate[bot]

example-java/protos/build.gradle

@@ -1,6 +1,6 @@
 buildscript {
     ext {
-        protobuf_version = '3.6.+'
+        protobuf_version = '3.6.1'
     }
 
     repositories {

gradle/libs.versions.toml

@@ -13,7 +13,7 @@ shadow = "9.0.0-rc2"
 kethereum = "0.86.0"
 jackson = "2.15.3"
 kotest = "5.7.2"
-kotest-4 = "4.4.+"
+kotest-4 = "4.4.3"
 
 [plugins]
 shadow = { id = "com.gradleup.shadow", version.ref = "shadow" }