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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#require execbit

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  $ hg init repo

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  $ cd repo

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  $ echo foo > foo

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  $ chmod 644 foo

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  $ hg ci -qAm '644'

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  $ chmod 755 foo

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  $ hg ci -qAm '755'

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reverting to rev 0

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  $ hg revert -a -r 0

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  reverting foo

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  $ hg st

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  M foo

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  $ hg diff --git

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  diff --git a/foo b/foo

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  old mode 100755

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  new mode 100644

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  $ cd ..