Fix publish CI

Author: frankie567

.github/workflows/sdk_publish.yaml

@@ -32,8 +32,8 @@ jobs:
           # mask the newly minted API token, so that we don't accidentally leak it
           echo "::add-mask::${api_token}"
 
-          # see the next step in the workflow for an example of using this step output
-          echo "api-token=${api_token}" >> "${GITHUB_OUTPUT}"
+          # set the output for the job
+          echo "::set-output name=api-token::${api_token}"
   publish:
     needs: mint-token
     uses: speakeasy-api/sdk-generation-action/.github/workflows/sdk-publish.yaml@v15