In update-multitenant-deb workflow, update reference to the hasura/ap…

…i-pg group to hasura/engine (#629)

<!-- The PR description should answer 2 (maybe 3) important questions:
-->

### What

hasura/api-pg group was renamed to hasura/engine

<!-- What is this PR trying to accomplish (and why, if it's not
obvious)? -->

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### How

This PR updates the update-multitenant-dep workflow to use the new group
name

<!-- How is it trying to accomplish it (what are the implementation
steps)? -->

.github/workflows/update-multitenant-dep.yaml

@@ -79,7 +79,7 @@ jobs:
             --title "dep update: update ndc-postgres to $LATEST_SHORT_SHA" \
             --head "$BRANCH_NAME" \
             --base "main" \
-            --reviewer "hasura/api-pg"
+            --reviewer "hasura/engine"
 
       # scream into Slack if something goes wrong
       - name: Report Status