Bump pip from 20.0.2 to 23.3

Bumps [pip](https://github.com/pypa/pip) from 20.0.2 to 23.3.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@20.0.2...23.3)

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

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

requirements.txt

@@ -5,7 +5,7 @@ github3.py==0.9.6
 idna==3.6
 Jinja2==3.1.3
 MarkupSafe==2.1.5
-pip==20.0.2
+pip==23.3
 requests==2.31.0
 retrying==1.3.4
 setuptools==45.2.0