mail/exim: update 4.95 -> 4.96

PR: 265098
Obtained-from: https://salsa.debian.org/exim-team/exim4/-/blob/master/debian/patches/
Reported-by: vvd
Approved-by: fluffy
Reviewed-by: drs-freebsd@sieborger.nom.za
Tested-by: pi, drs-freebsd@sieborger.nom.za
Changes: https://lists.exim.org/lurker/message/20220625.141825.d6de6074.en.html