packaging: update dulwich to drop the certifi dependency on Windows
The presence of `certifi` causes the system certificate store to be ignored,
which was reported as a bug against TortoiseHg[1]. It was only pulled in on
Windows because of `dulwich`, which was copied from the old TortoiseHg install
scripts, in order to support `hg-git`.
This version of `dulwich` raises the minimum `urllib3` to a version (1.25) that
does certificate verification by default, without the help of `certifi`[2]. We
already bundle a newer version of `urllib3`. Note that `certifi` can still be
imported from the user site directory, if installed there. But the installer no
longer disables the system certificates by default.
[1] https://foss.heptapod.net/mercurial/tortoisehg/thg/-/issues/5825
[2] https://github.com/jelmer/dulwich/issues/1025
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----