Bump spatie/laravel-sitemap in the php-dependencies group (#1278)

Bumps the php-dependencies group with 1 update: [spatie/laravel-sitemap](https://github.com/spatie/laravel-sitemap).


Updates `spatie/laravel-sitemap` from 7.3.5 to 7.3.6
- [Release notes](https://github.com/spatie/laravel-sitemap/releases)
- [Changelog](https://github.com/spatie/laravel-sitemap/blob/main/CHANGELOG.md)
- [Commits](spatie/laravel-sitemap@7.3.5...7.3.6)

---
updated-dependencies:
- dependency-name: spatie/laravel-sitemap
  dependency-version: 7.3.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: php-dependencies
...

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Author: dependabot[bot]