uses docker buildx v0.15.1 for transport interop test

.github/workflows/interop.yml

@@ -17,6 +17,8 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: docker/setup-buildx-action@v3
+        with:
+          version: v0.15.1
       - name: Build image
         run: docker buildx build --load -t nim-libp2p-head -f tests/transport-interop/Dockerfile .
       - name: Run tests