Fix some Debian packaging issues

debian/control

@@ -7,7 +7,7 @@ Standards-Version: 4.1.3
 
 Package: gitlab-deps
 Architecture: all
-Depends: ${python:Depends}, ${misc:Depends}
+Depends: ${python3:Depends}, ${misc:Depends}
 Description: Gitlab dependencies tool
  Build dependency maps between Gitlab projects and
  automatically trigger rebuilds on pipeline completion.

debian/rules

@@ -8,6 +8,7 @@ export PYBUILD_NAME=gitlab-deps
 
 override_dh_auto_install:
 	dh_auto_install
+	install -d -o root -g root -m 755 $(CURDIR)/debian/gitlab-deps/usr/sbin
 	install -o root -g root -m 755 $(CURDIR)/contrib/start-server.sh \
 	  $(CURDIR)/debian/gitlab-deps/usr/sbin/gitlab-deps-server-wrapper
 	install -o root -g root -m 755 $(CURDIR)/contrib/update.sh \