use https instead of git for Vcs-Git

Reported-By: lintian: vcs-field-uses-insecure-uri
Git-Dch: Ignore

debian/control

@@ -12,7 +12,7 @@ Build-Depends: dpkg-dev (>= 1.17.14), debhelper (>= 9.20141010), libdb-dev,
  autotools-dev, autoconf, automake, libgtest-dev <!nocheck>, dh-systemd
 Build-Depends-Indep: doxygen, w3m, graphviz
 Build-Conflicts: autoconf2.13, automake1.4
-Vcs-Git: git://anonscm.debian.org/apt/apt.git
+Vcs-Git: https://anonscm.debian.org/git/apt/apt.git
 Vcs-Browser: https://anonscm.debian.org/cgit/apt/apt.git
 Testsuite: autopkgtest