🏃 Clean up OWNERS who haven't been active in the last year

Otherwise ppl will ask them to review their changes without any
realistic chance of that happening.

OWNERS_ALIASES

@@ -14,8 +14,6 @@ aliases:
 
   # non-admin folks who can approve any PRs in the repo
   controller-runtime-approvers:
-  - gerred
-  - shawn-hurley
   - alvaroaleman
   - fillzpp
   - sbueringer
@@ -24,9 +22,7 @@ aliases:
   # include approvers & admins -- those count too via the OWNERS
   # file)
   controller-runtime-reviewers:
-  - alenkacz
   - vincepri
-  - alexeldeib
   - varshaprasad96
   - fillzpp
   - sbueringer