ci: pass only required secret to reusable workflow

The called workflow only declares ABLY_AWS_ACCOUNT_ID_SDK in its
workflow_call.secrets contract. Replace secrets: inherit with an
explicit passthrough so other repo secrets aren't forwarded into a
workflow that has no need for them.

Author: emptyhammond

.github/workflows/features.yml

@@ -17,4 +17,5 @@ jobs:
     uses: ably/features/.github/workflows/sdk-features.yml@6b3fc7a8ede2ebdd7a6325314f3a96c6466f1453 # main
     with:
       repository-name: ably-ruby
-    secrets: inherit
+    secrets:
+      ABLY_AWS_ACCOUNT_ID_SDK: ${{ secrets.ABLY_AWS_ACCOUNT_ID_SDK }}