Revert "Add signing key for Fedora 40 (#88)"

This reverts commit 14cfe8a.

Revert the commit since we already had an approved PR (#86) that added the F40
signing key and we should use that instead. PR #86 also bumps the 'Release'
field and adds to the changelog, which was missing in the old commit.

Next step is to pull in #86.

Signed-off-by: Tony Hutter <hutter2@llnl.gov>

Author: tonyhutter

zfs-release/zfs-release.spec

@@ -81,8 +81,6 @@ 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