Bump pyrsistent from 0.17.3 to 0.18.0 (#1405)

Bumps [pyrsistent](https://github.com/tobgu/pyrsistent) from 0.17.3 to 0.18.0.
- [Release notes](https://github.com/tobgu/pyrsistent/releases)
- [Changelog](https://github.com/tobgu/pyrsistent/blob/master/CHANGES.txt)
- [Commits](tobgu/pyrsistent@v0.17.3...v0.18.0)

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

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

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

requirements.txt

@@ -30,7 +30,7 @@ pyramid==1.10.8
 pyramid-mailer==0.15.1
 pyramid-multiauth==0.9.0
 pyramid-tm==2.4
-pyrsistent==0.17.3
+pyrsistent==0.18.0
 python-dateutil==2.8.1
 repoze.sendmail==4.4.1
 requests==2.25.1