Windows: distFiles contain backslashes since glob v10, producing broken S3 keys downstream

### Summary

`ember-cli-deploy-build@3.0.0` builds `context.distFiles` with:

```js
distFiles: glob.sync('**/*', { cwd: outputPath, nodir: true, dot: true })
```

and depends on `glob@^10.2.6`. Since the glob v9 rewrite, `glob.sync` returns **platform-native path separators** (this was a breaking change from v7/v8, which always returned `/`). On Windows, `distFiles` therefore come out as `assets\app-.js` instead of `assets/app-.js`.

Downstream plugins use these strings verbatim. `ember-cli-deploy-s3` uploads objects under literal-backslash keys (`assets\app.js` — `%5C` in the URL), so every asset ends up unreachable at its expected `assets/...` URL.

### Observed impact

Deploying the same commit:

- from Linux/macOS → works, objects keyed `assets/...`
- from Windows → site is down: `index.html` (uploaded at the bucket root by `ember-cli-deploy-s3-index`, so unaffected) references `assets/...`, CloudFront finds nothing there and the SPA 404-fallback serves `index.html` in place of every script. With `ember-cli-sri` this surfaces as SRI errors where **every asset reports the same computed hash** (the hash of index.html) — quite misleading until you notice the backslash-keyed objects in the bucket.

### Root cause

glob v9+ returns `\`-separated paths on Windows unless the `posix: true` option is passed (see the "Windows" section of the glob README).

### Suggested fix

Pass `posix: true` to both `glob.sync` calls in `index.js` (lines 24 and 58):

```js
glob.sync('**/*', { cwd: outputPath, nodir: true, dot: true, posix: true })
```

This restores the pre-v9 behavior of always emitting `/`, which is what every consumer of `distFiles` expects (S3 keys, manifest entries, URLs).

### Workaround

Pin glob back to v8 for this package, e.g. with yarn resolutions:

```json
"resolutions": { "ember-cli-deploy-build/glob": "^8.1.0" }
```

### Environment

- ember-cli-deploy-build 3.0.0 (glob resolves to 10.5.0)
- ember-cli-deploy 2.0.0, ember-cli-deploy-s3 5.x, ember-cli-deploy-s3-index 4.x
- Windows (any); Linux/macOS unaffected

Open index.js and inspect the glob.sync calls at lines 24 and 58, starting with how they populate distFiles on Windows. Update the glob options so emitted paths use forward slashes, then verify that generated distFiles and downstream S3 object keys use the expected assets/... form.

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