Set parser version to lowest compatible with tla2bAST 1.1.0

Upgrading tla2bAST causes compile errors.

build.gradle

@@ -25,7 +25,7 @@ configurations.all {
  resolutionStrategy.cacheChangingModulesFor 0, 'seconds'
 }
 
-def parser_version = '2.9.17'
+def parser_version = '2.9.14'
 def tlatools_version = '1.0.2'
 
 dependencies {