Update documenteer requirement from <2 to <3

Updates the requirements on [documenteer](https://github.com/lsst-sqre/documenteer) to permit the latest version.
- [Release notes](https://github.com/lsst-sqre/documenteer/releases)
- [Changelog](https://github.com/lsst-sqre/documenteer/blob/main/CHANGELOG.md)
- [Commits](lsst-sqre/documenteer@0.1.0...2.3.0)

---
updated-dependencies:
- dependency-name: documenteer
  dependency-version: 2.3.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1 +1 @@
-documenteer[technote]<2
+documenteer[technote]<3