Update license to GPL-3.0-only

sshyp-mfa/share/licenses/sshyp-mfa/license

@@ -2,9 +2,8 @@
     Copyright (C) 2022  Randall Winkhart  idgr@tutanota.com
 
     This program is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
+    it under the terms of version 3 (only) of the GNU General Public License
+    as published by the Free Software Foundation.
 
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -12,4 +11,4 @@
     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 <http://www.gnu.org/licenses/>.