Add bsalamat to sig-scheduling-maintainers

OWNERS_ALIASES

 aliases:
   sig-scheduling-maintainers:
+    - bsalamat
     - davidopp
+    - k82cn
     - timothysc
     - wojtek-t
-    - k82cn
   sig-scheduling:
-    - davidopp
     - bsalamat
-    - timothysc
-    - wojtek-t
-    - k82cn
+    - davidopp
     - jayunit100
+    - k82cn
     - resouer
+    - timothysc
+    - wojtek-t
   sig-cli-maintainers:
     - adohe
     - brendandburns

plugin/cmd/kube-scheduler/OWNERS

 approvers:
-- davidopp
-- timothysc
-- k82cn
+- sig-scheduling-maintainers
 reviewers:
-- davidopp
-- bsalamat
-- timothysc
-- wojtek-t
-- k82cn
-- jayunit100
+- sig-scheduling

test/integration/scheduler_perf/OWNERS

 approvers:
+- bsalamat
 - davidopp
 - gmarek
 - jayunit100
 - timothysc
 - wojtek-t
 reviewers:
+- bsalamat
 - davidopp
 - jayunit100
 - k82cn