duti: fix sha1.

Closes #25581.
mutt: add mirror.

Closes #25576.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
safe-rm: update URL.

The `safe-rm.org.nz` domain is now deprecated and redirects to Launchpad.

Closes #25582.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>