ci: fix unixfs conformance spec name (#525)

Author: parkan

.github/workflows/gateway-conformance-unixfs.yml

@@ -64,7 +64,7 @@ jobs:
         uses: ipfs/gateway-conformance/.github/actions/test@v0.8
         with:
           gateway-url: http://127.0.0.1:8888
-          specs: +unixfs-gateway
+          specs: +path-unixfs-gateway
           json: output.json
           xml: output.xml
           html: output.html