ci: remove usage of self-hosted runners

Author: galargh

.github/workflows/main.yml

@@ -212,7 +212,7 @@ jobs:
 
   transport-interop:
     needs: build
-    runs-on: ${{ fromJSON(github.repository == 'libp2p/js-libp2p' && '["self-hosted", "linux", "x64", "4xlarge"]' || '"ubuntu-latest"') }}
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
       - uses: actions/setup-node@v4