Update handling outputs in build_icons.yml

Author: Thomas-Boi

.github/workflows/build_icons.yml

@@ -56,5 +56,5 @@ jobs:
           base: 'master'
           commit-message: 'Built new icons, icomoon.json and devicon.css'
           title: 'bot:build new icons, icomoon.json and devicon.css'
-          body: ${{ format(env.MESSAGE, steps.imgur_step.outputs.imgur_url ) }}
+          body: ${{ format(env.MESSAGE, fromJSON(steps.imgur_step.outputs.imgur_url)[0] ) }}
           delete-branch: true