textproc/py-sphinx: update to 4.5.0 release (+)

While sphinx project provided 5.x branch, update our tree with 4.5.0 release.
It will satisfy requirements for consumers (e.g, Django40 require sphinx>=4.5.0 for offline HTML docs)
Exp-run was fine for 4.4.0, 4.5.0 is a bugfix, so no additional tests assumed.

PR:	261505
Exp-run by:	antoine
Approved by:	python (lwhsu)