Convert references to https from http

tests/gzip/help-version.sh

@@ -15,7 +15,7 @@
 # GNU General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 # Ensure that $SHELL is set to *some* value and exported.
 # This is required for dircolors, which would fail e.g., when