Update arch/debian packaging source URLs

Let's use the actual URL to avoid warnings from git about getting
redirected.

.gitmodules

@@ -8,7 +8,7 @@
 	branch = factory
 [submodule "pkg/debian"]
 	path = pkg/debian
-	url = https://salsa.debian.org/systemd-team/systemd
+	url = https://salsa.debian.org/systemd-team/systemd.git
 	branch = debian/master
 [submodule "pkg/centos"]
 	path = pkg/centos
@@ -16,5 +16,5 @@
 	branch = c9s-sig-hyperscale
 [submodule "pkg/arch"]
 	path = pkg/arch
-	url = https://gitlab.archlinux.org/daandemeyer/systemd
+	url = https://gitlab.archlinux.org/daandemeyer/systemd.git
 	branch = strip