chore: update mcp-conformance-action to v1.4.2

Fixes step summary size limit issue by excluding full stderr logs from
the markdown report. Logs are still available in the uploaded artifact.

Author: SamMorrowDrums

.github/workflows/conformance.yml

@@ -17,7 +17,7 @@ jobs:
           fetch-depth: 0
 
       - name: Run MCP Conformance Test
-        uses: SamMorrowDrums/mcp-conformance-action@9778f25e4227644224e58320e9f9c0f6d79ba687 # v1.4.1
+        uses: SamMorrowDrums/mcp-conformance-action@288f0373655a2952a785c45dcf3bafc8f6cd592b # v1.4.2
         with:
           setup_go: "true"
           install_command: go mod download