Update canping submodule

This is just to make git status happy and do not notify me about the change.

diff --git a/canping b/canping
index 472c30c0ba17095562f9d4b493e78c6a76350659..0973b3949810436f26a663f747e8a3c22a844d72 160000 (submodule)
--- a/canping
+++ b/canping
@@ -1 +1 @@
-Subproject commit 472c30c0ba17095562f9d4b493e78c6a76350659
+Subproject commit 0973b3949810436f26a663f747e8a3c22a844d72