BRE-40 ADD: step to report upcoming release version to Slack (#3247)

.github/workflows/version-bump.yml

@@ -257,6 +257,14 @@ jobs:
           PR_NUMBER: ${{ steps.create-pr.outputs.pr_number }}
         run: gh pr merge $PR_NUMBER --squash --auto --delete-branch
 
+      - name: Report upcoming release version to Slack
+        if: ${{ steps.version-changed.outputs.changes_to_commit == 'TRUE' }}
+        uses: bitwarden/gh-actions/report-upcoming-release-version@main
+        with:
+          version: ${{ steps.set-final-version-output.outputs.version }}
+          project: ${{ github.repository }}
+          AZURE_KV_CI_SERVICE_PRINCIPAL: ${{ secrets.AZURE_KV_CI_SERVICE_PRINCIPAL }}
+
   cut_rc:
     name: Cut RC branch
     if: ${{ inputs.cut_rc_branch == true }}