update git URLs (git -> https; gitea)

Change-Id: I122aa939df79663a4f226565b32524b2bfdf7c68
diff --git a/README.vty-tests b/README.vty-tests
index ba1b87c..15d1b9f 100644
--- a/README.vty-tests
+++ b/README.vty-tests
@@ -1,6 +1,6 @@
 To run the configuration parsing and output (VTY) test suite, first install
 
-  git://git.osmocom.org/python/osmo-python-tests
+  https://gitea.osmocom.org/cellular-infrastructure/osmo-python-tests
 
 and pass the following configure options here: