Add missing comma to cloudformation parameters

Author: evanmarshall

.github/workflows/provision-bot.yml

@@ -132,5 +132,5 @@ jobs:
         capabilities: 'CAPABILITY_NAMED_IAM'
         no-fail-on-empty-changeset: "1"
         parameter-overrides: >-
-          LatestTag=${{ steps.rename-pondo-bot-image.outputs.pondo-bot-image-tag }}
+          LatestTag=${{ steps.rename-pondo-bot-image.outputs.pondo-bot-image-tag }},
           BranchName=${{ env.BRANCH_NAME }}