Remove release liaison for retiring projects

Qinling and Searchlight projects are retiring in
Wallaby[1], this commit removes their release liaisons.

[1]
http://lists.openstack.org/pipermail/openstack-discuss/2020-November/018637.html
http://lists.openstack.org/pipermail/openstack-discuss/2020-November/018638.html

Change-Id: I14bec973ec0c9fac2122d80a2789c56bd0659df7

data/release_liaisons.yaml

@@ -110,10 +110,6 @@ Puppet OpenStack:
   - name: 'Alex Schultz'
     irc: mwhahaha
     email: aschultz@redhat.com
-qinling:
-  - name: 'Lingxian Kong'
-    irc: lxkong
-    email: anlin.kong@gmail.com
 Quality Assurance:
   - name: 'Ghanshyam Mann'
     irc: gmann
@@ -126,10 +122,6 @@ sahara:
   - name: 'Telles Nobrega'
     irc: tenobreg/tellesnobrega
     email:
-searchlight:
-  - name: 'Trinh Nguyen'
-    irc: dangtrinhnt
-    email: dangtrinhnt@gmail.com
 senlin:
   - name: 'Qiming Teng'
     irc: Qiming