use GITHUB_TOKEN instead of GH_TOKEN

Author: guimachiavelli

.github/workflows/code-sample-automation.yml

@@ -13,4 +13,4 @@ jobs:
       - uses: actions/add-to-project@f5473ace9aeee8b97717b281e26980aa5097023f
         with:
           project-url: https://github.com/orgs/meilisearch/projects/44
-          github-token: ${{ secrets.GH_TOKEN }}
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/preview-info.yml

@@ -5,7 +5,7 @@ on:
     types: [opened]
 
 env:
-  GH_TOKEN: ${{ secrets.GH_TOKEN }}
+  GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
   CURRENT_BRANCH: ${{ github.event.pull_request.head.ref }}
 
 jobs: