Bump pip from 21.1 to 23.3

Bumps [pip](https://github.com/pypa/pip) from 21.1 to 23.3.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@21.1...23.3)

---
updated-dependencies:
- dependency-name: pip
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements_dev.txt

@@ -1,4 +1,4 @@
-pip==21.1
+pip==23.3
 bump2version==0.5.11
 wheel==0.38.1
 flake8==3.7.8