Fix shebang placement

671f8d2 introduced a license header to auto/extract_version.py before the
shebang, causing builds to fail like this:
  ../subprojects/unity/meson.build:7:0: ERROR: Failed running '/path/to/extract_version.py', binary or interpreter not executable.

auto/extract_version.py

@@ -1,11 +1,11 @@
+#!/usr/bin/env python3
 # =========================================================================
 #   Unity - A Test Framework for C
 #   ThrowTheSwitch.org
 #   Copyright (c) 2007-24 Mike Karlesky, Mark VanderVoord, & Greg Williams
 #   SPDX-License-Identifier: MIT
 # =========================================================================
 
-#!/usr/bin/env python3
 import re
 import sys