Fixes the missing source_url warning raised by jaraco.packaging.sphinx

Version 10.4.0 of jaraco.packaging.sphinx introduced the requirement to
provide a source_url. This commit adds the url to pyproject.toml but to avoid
duplication on the PyPI homepage we remove the repo url which was the
same.

Author: julianz-

docs/changelog-fragments.d/817.packaging.rst

@@ -0,0 +1,4 @@
+Fixed the source code repository URL not being correctly
+exposed in the project metadata.
+
+-- by :user:`julianz-`

pyproject.toml

@@ -61,11 +61,11 @@ email = "team@cherrypy.dev"
 
 [project.urls]
 Homepage = "https://cheroot.cherrypy.dev"
+"Source" = "https://github.com/cherrypy/cheroot"
 "Chat: Matrix" = "https://matrix.to/#/#cherrypy-space:matrix.org"
 "CI: GitHub" = "https://github.com/cherrypy/cheroot/actions"
 "Docs: RTD" = "https://cheroot.cherrypy.dev"
 "GitHub: issues" = "https://github.com/cherrypy/cheroot/issues"
-"GitHub: repo" = "https://github.com/cherrypy/cheroot"
 "Tidelift: funding" = "https://tidelift.com/subscription/pkg/pypi-cheroot?utm_source=pypi-cheroot&utm_medium=referral&utm_campaign=pypi"
 
 [project.readme]