Update webauthn requirement from ==2.5.* to ==2.6.* (#5269)

Updates the requirements on [webauthn](https://github.com/duo-labs/py_webauthn) to permit the latest version.
- [Release notes](https://github.com/duo-labs/py_webauthn/releases)
- [Changelog](https://github.com/duo-labs/py_webauthn/blob/master/CHANGELOG.md)
- [Commits](https://github.com/duo-labs/py_webauthn/compare/v2.5.0...v2.6.0)

---
updated-dependencies:
- dependency-name: webauthn
  dependency-version: 2.6.0
  dependency-type: direct:production
...

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pyproject.toml

@@ -100,7 +100,7 @@ dependencies = [
   "ua-parser==1.0.*",
   "vat_moss_forked==2020.3.20.0.11.0",
   "vobject==0.9.*",
-  "webauthn==2.5.*",
+  "webauthn==2.6.*",
   "zeep==4.3.*"
 ]