qvm-template: fix hardcoded '4.1' in default RPM keyring location

$ qvm-template install 'qubes-template-fedora-39-minimal-0:4.2.0-202311171650.rpm'
error: /etc/qubes/repo-templates/keys/RPM-GPG-KEY-qubes-4.1-primary: import read failed(2).
ERROR: Command '['rpmkeys', '--dbpath=/tmp/tmp9rhce9__', '--import', '/etc/qubes/repo-templates/keys/RPM-GPG-KEY-qubes-4.1-primary']' returned non-zero exit status 1.

qubesadmin/tools/qvm_template.py

@@ -130,7 +130,8 @@ def parser_add_command(cmd, help_str):
         help=('Specify files containing DNF repository configuration.'
             ' Can be used more than once.'))
     parser_main.add_argument('--keyring',
-        default='/etc/qubes/repo-templates/keys/RPM-GPG-KEY-qubes-4.1-primary',
+        default='/etc/qubes/repo-templates/keys/'
+                f'RPM-GPG-KEY-qubes-{qubes_release()}-primary',
         help='Specify a file containing default RPM public key. '
              'Individual repositories may point at repo-specific key '
              'using \'gpgkey\' option')