tabby-agent: User agent string containing newlines causes failed healthchecks

[ProjectFrank]

Describe the bug
When using emacs , the error below is raised causing healthchecks to fail.

Information about your version
tabby-agent version 1.8.0

Information about your GPU
Not relevant

Additional context

Logs:

{"level":20,"time":1736183692724,"pid":32410,"hostname":"MacBook-Pro-4.local","tag":"TabbyApiClient","msg":"Health check request: GET http://localhost:8082/v1/health. [6dde18a5-d70a-4ad3-a354-a71bb010dde1]"}
{"level":50,"time":1736183692724,"pid":32410,"hostname":"MacBook-Pro-4.local","tag":"TabbyApiClient","error":{"type":"TypeError","message":"Headers.set: \"Node.js/v20.9.0 tabby-agent/1.8.0 emacs/GNU Emacs 29.1 (build 1, aarch64-apple-darwin21.6.0, Carbon Version 165 AppKit 2113.6)\n of 2023-09-26\" is an invalid header value.","stack":"TypeError: Headers.set: \"Node.js/v20.9.0 tabby-agent/1.8.0 emacs/GNU Emacs 29.1 (build 1, aarch64-apple-darwin21.6.0, Carbon Version 165 AppKit 2113.6)\n of 2023-09-26\" is an invalid header value.\n    at webidl.errors.exception (node:internal/deps/undici/undici:1432:14)\n    at webidl.errors.invalidArgument (node:internal/deps/undici/undici:1443:28)\n    at _Headers.set (node:internal/deps/undici/undici:2016:31)\n    at Hxe (/Users/work/.nvm/versions/node/v20.9.0/lib/node_modules/tabby-agent/dist/node/index.js:381:2913)\n    at o (/Users/work/.nvm/versions/node/v20.9.0/lib/node_modules/tabby-agent/dist/node/index.js:381:1317)\n    at Object.GET (/Users/work/.nvm/versions/node/v20.9.0/lib/node_modules/tabby-agent/dist/node/index.js:381:1875)\n    at JB.healthCheck (/Users/work/.nvm/versions/node/v20.9.0/lib/node_modules/tabby-agent/dist/node/index.js:387:1278)\n    at JB.connect (/Users/work/.nvm/versions/node/v20.9.0/lib/node_modules/tabby-agent/dist/node/index.js:387:527)\n    at Timeout._onTimeout (/Users/work/.nvm/versions/node/v20.9.0/lib/node_modules/tabby-agent/dist/node/index.js:386:2348)\n    at listOnTimeout (node:internal/timers:573:17)"},"msg":"Health check request failed. [6dde18a5-d70a-4ad3-a354-a71bb010dde1]"}

[icycodes]

Hi @ProjectFrank,
Thank you for reporting this bug.
I will fix it in the next release.