build(deps): update dulwich requirement in /requirements

Updates the requirements on [dulwich](https://github.com/dulwich/dulwich) to permit the latest version.
- [Release notes](https://github.com/dulwich/dulwich/releases)
- [Changelog](https://github.com/jelmer/dulwich/blob/master/NEWS)
- [Commits](jelmer/dulwich@dulwich-0.21.7...dulwich-0.22.1)

---
updated-dependencies:
- dependency-name: dulwich
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements/embedded.txt

@@ -4,6 +4,6 @@
 # python -m pip install --no-deps -U -r requirements/embedded.txt -t qgis_resource_sharing/ext_libs
 # -----------------------
 
-dulwich>=0.21.7,<0.22
+dulwich>=0.21.7,<0.23
 giturlparse>=0.9,<0.13
 pathvalidate>=3.1,<3.3