Upgrade slidev once upstream theme color bug is solved
Starting with Slidev v52.10.x the `--slidev-theme-primary` color is **NOT** overridden anymore from a custom theme. The value is always used from the default Slidev theme.
See:
* https://github.com/slidevjs/slidev/issues/2412
* https://github.com/slidevjs/slidev/issues/2431
* https://github.com/slidevjs/slidev/issues/2439
Once this bug is solved, we can update the `package.json` values for `@slidev/types` and `@slidev/cli` back to `^52.8.0` and run `pnpm update`:
```json
"dependencies": {
"@slidev/types": "52.8.0",
"@iconify-json/mdi": "^1.2.3",
"playwright-chromium": "^1.58.0"
},
"devDependencies": {
"@slidev/cli": "52.8.0"
},
```
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