Bump iso8601 from 2.0.0 to 2.1.0

Bumps [iso8601](https://github.com/micktwomey/pyiso8601) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/micktwomey/pyiso8601/releases)
- [Changelog](https://github.com/micktwomey/pyiso8601/blob/main/CHANGELOG.md)
- [Commits](https://github.com/micktwomey/pyiso8601/compare/2.0.0...2.1.0)

---
updated-dependencies:
- dependency-name: iso8601
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pyproject.toml

@@ -46,7 +46,7 @@ flask-migrate = "==4.0.5"
 flask-redis = "==0.4.0"
 flask-sqlalchemy = "==3.0.5"
 gunicorn = {version = "==21.2.0", extras = ["eventlet"]}
-iso8601 = "==2.0.0"
+iso8601 = "==2.1.0"
 itsdangerous = "==2.1.2"
 jsonschema = {version = "==4.17.0", extras = ["format"]}
 lxml = "==4.9.3"