ci: run conformance v0.3

Author: hacdias

.github/workflows/gateway-conformance.yml

@@ -40,7 +40,7 @@ jobs:
 
       # 4. Run the gateway-conformance tests
       - name: Run gateway-conformance tests
-        uses: ipfs/gateway-conformance/.github/actions/test@261cc49391dcd2bddd7704ad28b236dc4a63c424
+        uses: ipfs/gateway-conformance/.github/actions/test@v0.3
         with:
           gateway-url: http://127.0.0.1:8040
           json: output.json