Fix response type of putExtensibleStringValue in special-words spec

[msyyc]

moved from #9953

Follow-up to #9785: the putExtensibleStringValue operation was missing an explicit response content-type header, inconsistent with the pattern used by other extensible enum endpoints.

• Updated return type in packages/http-specs/specs/special-words/main.tsp:

putExtensibleStringValue(@body body: ExtensibleString): {
    @header contentType: "application/json";
    @body body: ExtensibleString;
};

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• telemetry.astro.build
  • Triggering command: /home/REDACTED/work/_temp/ghcca-node/node/bin/node node /home/REDACTED/work/typespec/typespec/website/node_modules/.bin/../astro/astro.js build sh s/.b�� ../../website/sr--llmstxt sh _modules/pnpm/dist/node-gyp-bin/node --no-emit git _modules/pnpm/digenerate-scenarios-summary node tobu�� build.json sh /.bin/sh ld.json && pnpm node pnpm tobuf/reference node (dns block)

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• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
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[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@typespec/http-specs@9987

commit: 39139db

[azure-sdk]

You can try these changes here

🛝 Playground	🌐 Website	🛝 VSCode Extension

[Copilot]

@msyyc I've opened a new pull request, #9992, to work on those changes. Once the pull request is ready, I'll request review from you.

[weidongxu-microsoft]

unsure whether it should go patch