Update token reference in deployment workflow

Changed the token reference within the Github actions deployment workflow to use secrets instead of environment variables. This enhances security as sensitive data is not exposed in the environment.

.github/workflows/deployment.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     environment: production
     env:
-      VITE_BETTERSTACK_TOKEN: ${{ env.VITE_BETTERSTACK_TOKEN }}
+      VITE_BETTERSTACK_TOKEN: ${{ secrets.VITE_BETTERSTACK_TOKEN }}
 
     steps:
       - uses: actions/checkout@v4