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

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  $ hg init base

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  $ cd base

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  $ echo 'alpha' > alpha

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  $ hg ci -A -m 'add alpha'

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  adding alpha

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  $ cd ..

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  $ hg clone base work

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  updating to branch default

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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  $ cd work

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  $ echo 'beta' > beta

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  $ hg ci -A -m 'add beta'

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  adding beta

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  $ cd ..

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  $ cd base

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  $ echo 'gamma' > gamma

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  $ hg ci -A -m 'add gamma'

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  adding gamma

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  $ cd ..

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  $ cd work

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  $ hg pull -q

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  $ hg merge

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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  (branch merge, don't forget to commit)

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Update --clean to revision 1 to simulate a failed merge:

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  $ rm alpha beta gamma

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  $ hg update --clean 1

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  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  $ cd ..