Bump pip from 25.3 to 26.0.1 (#2032)

* Bump pip from 25.3 to 26.0.1

Bumps [pip](https://github.com/pypa/pip) from 25.3 to 26.0.1.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@25.3...26.0.1)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: 26.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

* Add changelog entry

* Update test assertion

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ed Morley <[email protected]>

Author: dependabot[bot]

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## [Unreleased]
 
+- Updated pip from 25.3 to 26.0.1. ([#2032](https://github.com/heroku/heroku-buildpack-python/pull/2032))
 
 ## [v336] - 2026-03-02
 

requirements/pip.txt

@@ -1 +1 @@
-pip==25.3
+pip==26.0.1

spec/hatchet/pip_spec.rb

@@ -349,7 +349,7 @@
       app.deploy do |app|
         expect(clean_output(app.output)).to include(<<~OUTPUT)
           remote: -----> Installing dependencies using 'pip install -r requirements.txt'
-          remote:        ERROR: Invalid requirement: 'an-invalid-requirement!': Expected end or semicolon (after name and no valid version specifier)
+          remote:        ERROR: Invalid requirement: 'an-invalid-requirement!': Expected semicolon (after name with no version specifier) or end
           remote:            an-invalid-requirement!
           remote:                                  ^ (from line 1 of requirements.txt)
           remote: