Bump pip from 20.3.3 to 23.1.2 in /.github/workflows

Bumps [pip](https://github.com/pypa/pip) from 20.3.3 to 23.1.2.
- [Release notes](https://github.com/pypa/pip/releases)
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@20.3.3...23.1.2)

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

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

.github/workflows/constraints.txt

@@ -1,4 +1,4 @@
-pip==20.3.3
+pip==23.1.2
 nox==2020.12.31
 poetry==1.1.4
 virtualenv==20.3.1