gh-144538: Upgrade bundled pip to 26.0.1

[notatallshaw]

• Issue: Update bundled pip to 26.0.1 #144538

[hugovk]

Thanks!

[miss-islington-app]

Thanks @notatallshaw for the PR, and @pfmoore for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[miss-islington-app]

Thanks @notatallshaw for the PR, and @pfmoore for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

[bedevere-app]

GH-144561 is a backport of this pull request to the 3.13 branch.

[bedevere-app]

GH-144562 is a backport of this pull request to the 3.14 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 FreeBSD14 3.13 (tier-3) has failed when building commit ac9bc7c.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1481/builds/1870) and take a look at the build logs.
4. Check if the failure is related to this commit (ac9bc7c) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1481/builds/1870

Failed tests:

• test_httpservers

Failed subtests:

• test_large_content_length_truncated - test.test_httpservers.CGIHTTPServerTestCase.test_large_content_length_truncated

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.13.opsec-fbsd14/build/Lib/test/test_httpservers.py", line 1028, in test_large_content_length_truncated
    res = self.request('/cgi-bin/file1.py', 'POST', b'x', headers)
  File "/home/buildbot/buildarea/3.13.opsec-fbsd14/build/Lib/test/test_httpservers.py", line 89, in request
    return self.connection.getresponse()
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/home/buildbot/buildarea/3.13.opsec-fbsd14/build/Lib/http/client.py", line 1450, in getresponse
    response.begin()
    ~~~~~~~~~~~~~~^^
  File "/home/buildbot/buildarea/3.13.opsec-fbsd14/build/Lib/http/client.py", line 336, in begin
    version, status, reason = self._read_status()
                              ~~~~~~~~~~~~~~~~~^^
  File "/home/buildbot/buildarea/3.13.opsec-fbsd14/build/Lib/http/client.py", line 297, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
               ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.13.opsec-fbsd14/build/Lib/socket.py", line 719, in readinto
    return self._sock.recv_into(b)
           ~~~~~~~~~~~~~~~~~~~~^^^
ConnectionResetError: [Errno 54] Connection reset by peer