Bump pip from 21.1.2 to 21.1.3 (#180)

Bumps [pip](https://github.com/pypa/pip) from 21.1.2 to 21.1.3.
- [Release notes](https://github.com/pypa/pip/releases)
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@21.1.2...21.1.3)

---
updated-dependencies:
- dependency-name: pip
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

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

Author: dependabot[bot]

requirements_dev.txt

@@ -1,6 +1,6 @@
 black==21.6b0
 blacken-docs==1.10.0
-pip==21.1.2
+pip==21.1.3
 pre-commit==2.13.0
 twine==3.4.1
 wheel==0.36.2