Bump postcss-selector-parser in /extensions/ql-vscode

Bumps [postcss-selector-parser](https://github.com/postcss/postcss-selector-parser) from 7.1.0 to 7.1.5.
- [Release notes](https://github.com/postcss/postcss-selector-parser/releases)
- [Changelog](https://github.com/postcss/postcss-selector-parser/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss-selector-parser@v7.1.0...7.1.5)

---
updated-dependencies:
- dependency-name: postcss-selector-parser
  dependency-version: 7.1.5
  dependency-type: indirect
...

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Author: dependabot[bot]