Use OCI instead of Unity in .mailmap

.mailmap

@@ -8,9 +8,9 @@
 # what's printed by:
 #   git shortlog --summary --numbered --email
 
-Justin Wilson <wilsonj@unityfoundation.io> <[email protected]>
-Justin Wilson <wilsonj@unityfoundation.io> Justin R. Wilson
-Justin Wilson <wilsonj@unityfoundation.io> <wilsonj@objectcomputing.com>
+Justin Wilson <wilsonj@objectcomputing.com> <[email protected]>
+Justin Wilson <wilsonj@objectcomputing.com> Justin R. Wilson
+Justin Wilson <wilsonj@objectcomputing.com> <wilsonj@unityfoundation.io>
 
 Jeff Schmitz <[email protected]> <[email protected]>
 Jeff Schmitz <[email protected]> iamtheschmitzer <[email protected]>
@@ -21,10 +21,10 @@ Paul Calabrese <[email protected]> <[email protected]>
 
 Huang-Ming Huang <[email protected]> <[email protected]>
 
-Fred Hornsey <hornseyf@unityfoundation.io> <[email protected]>
-Fred Hornsey <hornseyf@unityfoundation.io> Frederick Hornsey
-Fred Hornsey <hornseyf@unityfoundation.io> <hornseyf@objectcomputing.com>
-Fred Hornsey <hornseyf@unityfoundation.io> iguessthislldo <[email protected]>
+Fred Hornsey <hornseyf@objectcomputing.com> <[email protected]>
+Fred Hornsey <hornseyf@objectcomputing.com> Frederick Hornsey
+Fred Hornsey <hornseyf@objectcomputing.com> <hornseyf@unityfoundation.io>
+Fred Hornsey <hornseyf@objectcomputing.com> iguessthislldo <[email protected]>
 
 Doug Lewis <[email protected]> unknown <[email protected]>