Bump pip from 25.2 to 25.3 in /requirements (#9961)

Bumps [pip](https://github.com/pypa/pip) from 25.2 to 25.3.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@25.2...25.3)

---
updated-dependencies:
- dependency-name: pip
  dependency-version: '25.3'
  dependency-type: indirect
...

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

Author: dependabot[bot]

requirements/checkdocs.txt

@@ -109,7 +109,7 @@ zipp==3.19.1
     # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file:
-pip==25.2
+pip==25.3
     # via pip-tools
 setuptools==78.1.1
     # via pip-tools

requirements/checkformatting.txt

@@ -30,7 +30,7 @@ zipp==3.19.1
     # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file:
-pip==25.2
+pip==25.3
     # via pip-tools
 setuptools==78.1.1
     # via pip-tools

requirements/coverage.txt

@@ -30,7 +30,7 @@ zipp==3.19.1
     # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file:
-pip==25.2
+pip==25.3
     # via pip-tools
 setuptools==78.1.1
     # via pip-tools