Chore(deps): Update iso8601 requirement in /stac_fastapi/types (#608)

Updates the requirements on [iso8601](https://github.com/micktwomey/pyiso8601) to permit the latest version.
- [Release notes](https://github.com/micktwomey/pyiso8601/releases)
- [Changelog](https://github.com/micktwomey/pyiso8601/blob/main/CHANGELOG.md)
- [Commits](micktwomey/pyiso8601@1.0.2...2.1.0)

---
updated-dependencies:
- dependency-name: iso8601
  dependency-type: direct:production
...

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

Author: dependabot[bot]

stac_fastapi/types/setup.py

@@ -11,7 +11,7 @@
     "pydantic[dotenv]<2",
     "stac_pydantic==2.0.*",
     "pystac==1.*",
-    "iso8601>=1.0.2,<2.1.0",
+    "iso8601>=1.0.2,<2.2.0",
 ]
 
 extra_reqs = {