build(deps): bump pyrsistent from 0.16.0 to 0.19.3

Bumps [pyrsistent](https://github.com/tobgu/pyrsistent) from 0.16.0 to 0.19.3.
- [Release notes](https://github.com/tobgu/pyrsistent/releases)
- [Changelog](https://github.com/tobgu/pyrsistent/blob/master/CHANGES.txt)
- [Commits](tobgu/pyrsistent@v0.16.0...v0.19.3)

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

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

test-requirements.txt

@@ -8,7 +8,7 @@ pytest-watch==4.2.0
 tox==3.7.0
 Werkzeug<2.1.0
 jsonschema==3.2.0
-pyrsistent==0.16.0 # TODO(py3): 0.17.0 requires python3, see https://github.com/tobgu/pyrsistent/issues/205
+pyrsistent==0.19.3 # TODO(py3): 0.17.0 requires python3, see https://github.com/tobgu/pyrsistent/issues/205
 executing
 asttokens
 ipdb