LOGC-63: Bump workbench to raft-coverage fix SHA

Pin workbench to the head of WKBCH-25 (scality/workbench#77) which
provisions the queue-populator for all data raft sessions. Without
this, raftId 3 was uncovered: any source bucket whose hash landed
there sat at ReplicationStatus=PENDING forever and the CRR e2e test
timed out.

Author: dvasilas

.github/workflows/e2e-tests.yaml

@@ -39,7 +39,7 @@ jobs:
           password: ${{ github.token }}
 
       - name: Start Workbench
-        uses: scality/workbench@316d4b2b4f8f914e264eda68eec1370c7fe91eef
+        uses: scality/workbench@f9a33d1636a580a077dc5382e4695175f1ce5cff
 
       - name: Wait for all services
         run: |