ci: don't recreate relayer deployment

We'll only bounce the relayer, not redeploy it. The go relayer is
currently broken, due to proto mismatch with Penumbra v0.61.0, and an
ibc-go version conflict that complicates the update. SL is working on
resolving. For now, we're running Hermes to provide IBC relaying.

.github/workflows/deploy-preview.yml

@@ -87,4 +87,4 @@ jobs:
       # we're still working on reliable packet relaying between test chains.
       - name: bounce relayer
         run: |-
-          ./deployments/scripts/bounce-relayer || true
+          kubectl rollout restart deployment relayer-preview || true