ci: Use GITHUB_OUTPUT envvar instead of set-output command

`save-state` and `set-output` commands used in GitHub Actions are deprecated and [GitHub recommends using environment files](https://github.blog/changelog/2023-07-24-github-actions-update-on-save-state-and-set-output-commands/).

This PR updates the usage of `set-output` to `$GITHUB_OUTPUT`

Instructions for envvar usage from GitHub docs:

https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-an-output-parameter

.github/workflows/smoke-test.yml

@@ -33,7 +33,7 @@ jobs:
           npm install ../mysql/$mysql_tar
           npm install ../postgres/$postgres_tar
           full_tar=$(npm pack | tail -1)
-          echo "::set-output name=full_sdk::$full_tar"
+          echo "full_sdk=$full_tar" >> $GITHUB_OUTPUT
 
       # Manually install the locally bundled packages first, then pull in other test dependencies from NPM
       # Remove the entire source code directory to force smoke test to depend on packed tarball