removed environment variable leak vulnerability

Author: veds12

.github/workflows/changelog_update.yml

@@ -25,9 +25,9 @@ jobs:
         run: |
           git config --local user.email ${{ secrets.AIDUDEZZZ_BOT_EMAIL }}
           git config --local user.name ${{ secrets.AIDUDEZZZ_BOT_USER }}
-          git add CHANGELOG.md && git commit -m 'Updated CHANGELOG.md' && echo ::set-env name=push::1 || echo "No changes to CHANGELOG.md"
+          git add CHANGELOG.md && git commit -m 'Updated CHANGELOG.md' && echo "push=true" >> $GITHUB_ENV || echo "No changes to CHANGELOG.md"
       - name: Push changes
-        if: env.push == 1
+        if: env.push == 'true'
         env: 
           CI_USER: ${{ secrets.AIDUDEZZZ_BOT_USER }}
           CI_TOKEN: ${{ secrets.AIDUDEZZZ_BOT_TOKEN }}