upgrade ruby-ast-gen version, remove unnecessary whitespace

Author: AndreiDreyer

joern-cli/frontends/rubysrc2cpg/src/main/resources/application.conf

@@ -1,4 +1,4 @@
 rubysrc2cpg {
-    ruby_ast_gen_version: "0.53.0"
+    ruby_ast_gen_version: "0.54.0"
     joern_type_stubs_version: "0.6.0"
 }