ci: use versioned cargo wrapper for crate ordering

ci/order-crates-for-publishing.py

@@ -12,10 +12,14 @@ import json
 import subprocess
 import sys;
 
+real_file = os.path.realpath(__file__)
+ci_path = os.path.dirname(real_file)
+src_root = os.path.dirname(ci_path)
+
 def load_metadata():
+    cmd = f'{src_root}/cargo metadata --no-deps --format-version=1'
     return json.loads(subprocess.Popen(
-        'cargo metadata --no-deps --format-version=1',
-        shell=True, stdout=subprocess.PIPE).communicate()[0])
+        cmd, shell=True, stdout=subprocess.PIPE).communicate()[0])
 
 def get_packages():
     metadata = load_metadata()