chore: update the version of the conformance suite. (#814)

It contains an important fix for client auth tests.

Author: maciej-kisiel

.github/workflows/conformance.yml

@@ -29,12 +29,13 @@ jobs:
           # Wait for the server to be ready.
           timeout 30 bash -c 'until curl -s http://localhost:3001/mcp; do sleep 0.5; done'
       - name: "Run conformance tests" 
-        uses: modelcontextprotocol/conformance@c2f3fdaf781dcd5a862cb0d2f6454c1c210bf0f0 # v0.1.11
+        uses: modelcontextprotocol/conformance@a2855b03582a6c0b31065ad4d9af248316ce61a3 # v0.1.15
         with:
           mode: server
           url: http://localhost:3001/mcp
           suite: active
           expected-failures: ./conformance/baseline.yml
+          node-version: 22
 
   client-conformance:
     runs-on: ubuntu-latest
@@ -46,9 +47,10 @@ jobs:
         with:
           go-version: "^1.25"
       - name: "Run conformance tests" 
-        uses: modelcontextprotocol/conformance@c2f3fdaf781dcd5a862cb0d2f6454c1c210bf0f0 # v0.1.11
+        uses: modelcontextprotocol/conformance@a2855b03582a6c0b31065ad4d9af248316ce61a3 # v0.1.15
         with:
           mode: client 
           command: go run ./conformance/everything-client/main.go
           suite: core
           expected-failures: ./conformance/baseline.yml
+          node-version: 22