ci: remove release-v3.3 rules

as we are no longer supporting
the release 3.3.x removing the
mergify rules for the same.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

.mergify.yml

@@ -122,44 +122,6 @@ pull_request_rules:
       merge: {}
       dismiss_reviews: {}
       delete_head_branch: {}
-  - name: backport patches to release-v3.3 branch
-    conditions:
-      - base=devel
-      - label=backport-to-release-v3.3
-    actions:
-      backport:
-        branches:
-          - release-v3.3
-  # automerge backports if CI successfully ran
-  - name: automerge backport release-v3.3
-    conditions:
-      - author=mergify[bot]
-      - base=release-v3.3
-      - label!=DNM
-      - "#approved-reviews-by>=2"
-      - "approved-reviews-by=@ceph/ceph-csi-contributors"
-      - "approved-reviews-by=@ceph/ceph-csi-maintainers"
-      - "status-success=codespell"
-      - "status-success=multi-arch-build"
-      - "status-success=go-test"
-      - "status-success=commitlint"
-      - "status-success=golangci-lint"
-      - "status-success=mod-check"
-      - "status-success=lint-extras"
-      - "#changes-requested-reviews-by=0"
-      - "status-success=ci/centos/mini-e2e-helm/k8s-1.20"
-      - "status-success=ci/centos/mini-e2e-helm/k8s-1.21"
-      - "status-success=ci/centos/mini-e2e-helm/k8s-1.22"
-      - "status-success=ci/centos/mini-e2e/k8s-1.20"
-      - "status-success=ci/centos/mini-e2e/k8s-1.21"
-      - "status-success=ci/centos/mini-e2e/k8s-1.22"
-      - "status-success=ci/centos/upgrade-tests-cephfs"
-      - "status-success=ci/centos/upgrade-tests-rbd"
-      - "status-success=DCO"
-    actions:
-      merge: {}
-      dismiss_reviews: {}
-      delete_head_branch: {}
   - name: backport patches to release-v3.4 branch
     conditions:
       - base=devel