Unconditionally depend on SNAPSHOT version of parser

Because the code currently uses a method that's not in the release
version yet. Once it's released, this should be changed to the
non-SNAPSHOT version.

build.gradle

@@ -22,13 +22,7 @@ configurations.all {
 	resolutionStrategy.cacheChangingModulesFor 0, 'seconds'
 }
 
-def parser_version
-if (isSnapshot) {
-	parser_version = '2.12.4-SNAPSHOT'
-}
-else {
-	parser_version = '2.12.3'
-}
+def parser_version = '2.12.4-SNAPSHOT'
 
 dependencies {
 	implementation(group: 'commons-cli', name: 'commons-cli', version: '1.4')