Prepare v6.1.0 release with updated cache dependency

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.licenses/npm/@typespec/ts-http-runtime.dep.yml

@@ -1,6 +1,6 @@
 ---
 name: "@typespec/ts-http-runtime"
-version: 0.3.6
+version: 0.3.9
 type: npm
 summary: Isomorphic client library for making HTTP requests in node.js and browser.
 homepage: https://github.com/Azure/azure-sdk-for-js/tree/main/sdk/core/ts-http-runtime/README.md