update git URLs (git -> https; gitea)

Change-Id: I8788fa6b0495b8ee72b1bb5485f6cd3a4835eb0b
diff --git a/debian/copyright b/debian/copyright
index fcdada7..b70653c 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -1,6 +1,6 @@
 Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: osmo-smlc
-Source: git://git.osmocom.org/osmo-smlc
+Source: https://gitea.osmocom.org/cellular-infrastructure/osmo-smlc
 
 Files:     *
 Copyright: 2020 Harald Welte <laforge@osmocom.org>