fix dry_run logic in milestone release job (#5861)

Author: pdabelf5

.github/workflows/release.yml

@@ -421,7 +421,7 @@ jobs:
             /repos/${{ github.repository }}/milestones \
             | jq --arg version ${{ inputs.nic_version }} -r \
             '.[] | select(.title == $version) | .number')
-          if ! ${{ inputs.dry_run }}
+          if ! ${{ inputs.dry_run }}; then
             gh api --method PATCH -H "Accept: application/vnd.github.v3+json" \
               /repos/${{ github.repository }}/milestones/${milestone_number} \
           else