Failure to retrieve username: Ls [HttpError]: fetch failed

**Describe the bug**
When I am editing a workflow file, and my mouse moves, I get an error box pup up repeatedly. It can pop up several times over the course of a single pointer movement down the file.

**To Reproduce**
Steps to reproduce the behavior:
1. Edit any workflow file
2. Hover over any any of several steps/components of the workflow
3. See error


When the popup occurs, I get this in the OUTPUT tab:

```
Failure to retrieve username: Ls [HttpError]: fetch failed
at /Users/user/.vscode/extensions/github.vscode-github-actions-0.27.0/dist/server-node.js:2:2789085
at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
at async /Users/user/.vscode/extensions/github.vscode-github-actions-0.27.0/dist/server-node.js:2:2861044
at async ka.get (/Users/user/.vscode/extensions/github.vscode-github-actions-0.27.0/dist/server-node.js:2:2871213)
at async /Users/user/.vscode/extensions/github.vscode-github-actions-0.27.0/dist/server-node.js:2:2860979
at async ca (/Users/user/.vscode/extensions/github.vscode-github-actions-0.27.0/dist/server-node.js:2:2860946)
at async /Users/user/.vscode/extensions/github.vscode-github-actions-0.27.0/dist/server-node.js:2:2864782
at async Object.getContext (/Users/user/.vscode/extensions/github.vscode-github-actions-0.27.0/dist/server-node.js:2:2864738)
at async oi (/Users/user/.vscode/extensions/github.vscode-github-actions-0.27.0/dist/server-node.js:2:2727430)
at async /Users/user/.vscode/extensions/github.vscode-github-actions-0.27.0/dist/server-node.js:2:2874871 {
status: 500,
request: {
method: 'GET',
url: 'https://api.github.com/user',
headers: {
accept: 'application/vnd.github.v3+json',
'user-agent': 'VS Code GitHub Actions (0.27.0) octokit-rest.js/19.0.7 octokit-core.js/4.1.0 Node.js/20.16.0 (darwin; arm64)',
authorization: 'token [REDACTED]'
},
request: { hook: [Function: bound bound e] }
}
}
[Error - 10:04:44 AM] Request textDocument/hover failed.
Message: Request textDocument/hover failed with message: fetch failed
Code: -32603
```

I tried following the advice in https://github.com/github/vscode-github-actions/issues/282, but that did not help. However, after disabling GitHub Actions, restarting Extensions and enabling GitHub Actions, I got this similar error in the OUTPUT (only differences posted):

```
Failure to retrieve username: Ls [HttpError]: fetch failed
.
.
at async _n (/Users/user/.vscode/extensions/github.vscode-github-actions-0.27.0/dist/server-node.js:2:2763253) {
.
.
}
[Error - 10:10:37 AM] Unhandled error while validating: fetch failed
```

**Additional context**
macOS Sonoma 14.7
The GitHub Actions activity bar icon works fine

Start by reproducing the hover-triggered failure in a workflow file with GitHub Actions extension 0.27.0, then inspect the reported calls in dist/server-node.js and the request to https://api.github.com/user. Compare the behavior with issue #282. Done means hover validation no longer repeatedly shows an error or produces fetch-failed output.

由索引模型根據 Issue 內容生成。