Bug: Internal Error after a 502 HTTP error

The GitHub action seems not handle this error case correctly.

Here are the error:

```log
Internal error! Please file a bug at https://github.com/google/wireit/issues/new, mention this message, that you encountered it in wireit version 0.14.12, and give information about your package.json files.
Unknown error thrown: Error: GitHub Cache check HTTP 502 error: ...
(Long HTML)

at GitHubActionsCache.get (file:///home/runner/work/puppeteer/puppeteer/node_modules/wireit/lib/caching/github-actions-cache.js:238:19)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async file:///home/runner/work/puppeteer/puppeteer/node_modules/wireit/lib/execution/standard.js:87:23
at async #acquireSystemLockIfNeeded (file:///home/runner/work/puppeteer/puppeteer/node_modules/wireit/lib/execution/standard.js:163:28)
at async StandardScriptExecution._execute (file:///home/runner/work/puppeteer/puppeteer/node_modules/wireit/lib/execution/standard.js:47:20)
at async StandardScriptExecution.execute (file:///home/runner/work/puppeteer/puppeteer/node_modules/wireit/lib/execution/base.js:34:20)
at async Promise.all (index 1)
at async StandardScriptExecution._executeDependencies (file:///home/runner/work/puppeteer/puppeteer/node_modules/wireit/lib/execution/base.js:48:35)
at async StandardScriptExecution._execute (file:///home/runner/work/puppeteer/puppeteer/node_modules/wireit/lib/execution/standard.js:37:44)
```

https://github.com/puppeteer/puppeteer/actions/runs/16411753531/job/46368197847