Bump pip from 23.2.1 to 23.3

Bumps [pip](https://github.com/pypa/pip) from 23.2.1 to 23.3.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@23.2.1...23.3)

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

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

requirements.txt

@@ -1,2 +1,2 @@
 octodns===1.2.1
-pip===23.2.1
+pip===23.3