OWNERS: remove Cyril

Cyril hasn't contributed to the project since 2019 and
doesn't seem to have an email address matching with his
Gerrit ID.  Removing from OWNERS file.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9e08d5f54cf8ec717b3ae874c987d7b06f59f8ed
diff --git a/OWNERS b/OWNERS
index 887c7ae..77b607e 100644
--- a/OWNERS
+++ b/OWNERS
@@ -37,7 +37,6 @@
 - joel@jms.id.au
 
 reviewers:
-- cyril.bur@au1.ibm.com
 
 matchers:
 
@@ -45,9 +44,6 @@
 - name: Andrew Jeffery
   email: andrew@aj.id.au
   discord: arj
-- name: Cyril Bur
-  email: cyril.bur@au1.ibm.com
-  discord: NA
 - name: Jeremy Kerr
   email: jk@ozlabs.org
   discord: jk-