Bump pekkoVersion from 1.3.0 to 1.4.0 (#657)

Author: dependabot[bot]

build.gradle

@@ -18,7 +18,7 @@ ext {
 
   scalaVersion = '3'
   scalaBinaryVersion = '3.7.4'
-  pekkoVersion = '1.3.0'
+  pekkoVersion = '1.4.0'
 
   tscfgVersion = '0.9.995'
   scapegoatVersion = '3.2.3'