Fix checklist for BCD upgrades workflow (round 3) (web-platform-dx#2079)

Apparently the search term needs to be single-quoted.

Author: ddbeck

.github/workflows/bcd_upgrade_checklist.yml

@@ -16,7 +16,7 @@ jobs:
         continue-on-error: true
         uses: dependabot/fetch-metadata@dbb049abf0d677abbd7f7eee0375145b417fdd34 #v2.2.0
 
-      - if: ${{ contains(steps.dependabot-metadata.outputs.dependency-names, "@mdn/browser-compat-data") }}
+      - if: ${{ contains(steps.dependabot-metadata.outputs.dependency-names, '@mdn/browser-compat-data') }}
         continue-on-error: true
         uses: peter-evans/create-or-update-comment@71345be0265236311c031f5c7866368bd1eff043 #v4.0.0
         with: