Fix for > Python 3.10

Author: Flova

ros2_numpy/registry.py

@@ -1,5 +1,5 @@
 import functools
-import collections
+from collections.abc import Sequence
 
 _to_numpy = {}
 _from_numpy = {}
@@ -21,7 +21,7 @@ def numpify(msg, *args, **kwargs):
         return
 
     conv = _to_numpy.get((msg.__class__, False))
-    if not conv and isinstance(msg, collections.Sequence):
+    if not conv and isinstance(msg, Sequence):
         if not msg:
             raise ValueError("Cannot determine the type of an empty Collection")
         conv = _to_numpy.get((msg[0].__class__, True))