Update sdk_publish.yaml

Author: ThomasRooney

.github/workflows/sdk_publish.yaml

@@ -10,7 +10,7 @@ jobs:
   publish:
     uses: speakeasy-api/sdk-generation-action/.github/workflows/sdk-publish.yaml@v15
     with:
-      runs-on: ubuntu-24.04
+      runs-on: ubuntu-22.04
     secrets:
       github_access_token: ${{ secrets.GITHUB_TOKEN }}
       nuget_api_key: ${{ secrets.NUGET_API_KEY }}