style(parser): use 4 space identation

Co-authored-by: Copilot <[email protected]>

Author: BeyondMagic

src/parser.y

@@ -558,13 +558,13 @@ static void parser_error_cleanup(AstProgram **out_program)
 
 int yyerror(AstProgram **out_program, const char *msg)
 {
-  (void)out_program;
-  fprintf(stderr,
-    "%s:%d:%d: syntax error: %s\n",
-    lexer_get_source_name(),
-    yy_token_line,
-    yy_token_column,
-    msg ? msg : "unknown");
+    (void)out_program;
+    fprintf(stderr,
+        "%s:%d:%d: syntax error: %s\n",
+        lexer_get_source_name(),
+        yy_token_line,
+        yy_token_column,
+        msg ? msg : "unknown");
     return 0;
 }