Fix block string matching not including newlines

alias/language/parser.mjs

···
   kind: x.tag,
   value: x[0],
 }))`
-  (:${'"""'} ${/.*(?=""")/} :${'"""'})
+  (:${'"""'} ${/[\s\S]+?(?=""")/} :${'"""'})
   | (:${'"'} ${/[^"\r\n]*/} :${'"'})
 `;