Add signing key for Fedora 40 (#88)

Add the signing key for Fedora 40 to zfs-release.spec

Signed-off-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>

Author: tonyhutter

zfs-release/zfs-release.spec

@@ -81,6 +81,8 @@ ln -s RPM-GPG-KEY-openzfs-2022 \
     $RPM_BUILD_ROOT%{_sysconfdir}/pki/rpm-gpg/RPM-GPG-KEY-openzfs-fedora-38
 ln -s RPM-GPG-KEY-openzfs-2022 \
     $RPM_BUILD_ROOT%{_sysconfdir}/pki/rpm-gpg/RPM-GPG-KEY-openzfs-fedora-39
+ln -s RPM-GPG-KEY-openzfs-2022 \
+    $RPM_BUILD_ROOT%{_sysconfdir}/pki/rpm-gpg/RPM-GPG-KEY-openzfs-fedora-40
 %endif
 
 # Yum .repo files