sn0int: Use language-specific heredocs

Author: issyl0

Formula/s/sn0int.rb

@@ -35,15 +35,15 @@ def install
   end
 
   test do
-    (testpath/"true.lua").write <<~EOS
+    (testpath/"true.lua").write <<~LUA
       -- Description: basic selftest
       -- Version: 0.1.0
       -- License: GPL-3.0
 
       function run()
           -- nothing to do here
       end
-    EOS
+    LUA
     system bin/"sn0int", "run", "-vvxf", testpath/"true.lua"
   end
 end