Update balena-io/deploy-to-balena-action action to v2.0.21

Author: renovate-bot

.github/workflows/balena.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
-      - uses: balena-io/deploy-to-balena-action@92665b240043f8c3d96835fafde500790d002c2e # v2.0.20
+      - uses: balena-io/deploy-to-balena-action@7b510487d7597ac2fad1a382bd4816db94be9fb3 # v2.0.21
         with:
           balena_token: ${{ secrets.BALENA_API_KEY }}
           github_token: ${{ secrets.GITHUB_TOKEN }}