Fix:

SyntaxWarning: invalid escape sequence '\d'

https://github.com/tamentis/cartman/issues/39
--- cm.orig	2020-03-14 15:32:57.000000000 -0500
+++ cm	2024-01-03 19:32:31.000000000 -0600
@@ -50,7 +50,7 @@
     # extra positional argument.
     if args.stdin_id:
         data = sys.stdin.read()
-        m = re.match(".*#(\d+).*", data, flags=(re.MULTILINE|re.DOTALL))
+        m = re.match(r".*#(\d+).*", data, flags=(re.MULTILINE|re.DOTALL))
         if not m:
             raise cartman.exceptions.UsageException("No id on stdin")