mailmap: Add entry for Joe Damato

My Fastly email address is no longer used. Add a mailmap entry to
reflect that.

Signed-off-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260303024202.2526604-1-joe@dama.to
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: Joe Damato

.mailmap

@@ -396,6 +396,7 @@ Jiri Slaby <jirislaby@kernel.org> <xslaby@fi.muni.cz>
 Jisheng Zhang <jszhang@kernel.org> <jszhang@marvell.com>
 Jisheng Zhang <jszhang@kernel.org> <Jisheng.Zhang@synaptics.com>
 Jishnu Prakash <quic_jprakash@quicinc.com> <jprakash@codeaurora.org>
+Joe Damato <joe@dama.to> <jdamato@fastly.com>
 Joel Granados <joel.granados@kernel.org> <j.granados@samsung.com>
 Johan Hovold <johan@kernel.org> <jhovold@gmail.com>
 Johan Hovold <johan@kernel.org> <johan@hovoldconsulting.com>