fix: allow shebangs to contain spaces

Author: jwnrt

grammar.js

@@ -1584,7 +1584,7 @@ module.exports = grammar({
 
     identifier: _ => /(r#)?[_\p{XID_Start}][_\p{XID_Continue}]*/,
 
-    shebang: _ => /#![\s]*[^\[\s]+/,
+    shebang: _ => /#![\s]*[^\[].+/,
 
     _reserved_identifier: $ => alias(choice(
       'default',

test/corpus/source_files.txt

@@ -218,3 +218,13 @@ const ψ_2 : Ψ = 1;
     (identifier)
     (type_identifier)
     (integer_literal)))
+
+================================================================================
+Shebang line containing spaces
+================================================================================
+
+#!/usr/bin/env -S cargo +nightly -Zscript
+--------------------------------------------------------------------------------
+
+(source_file
+  (shebang))