chore: bump xenon from 0.7.1 to 0.7.3 (#446)

Bumps [xenon](https://github.com/rubik/xenon) from 0.7.1 to 0.7.3.
- [Release notes](https://github.com/rubik/xenon/releases)
- [Changelog](https://github.com/rubik/xenon/blob/master/CHANGELOG)
- [Commits](rubik/xenon@v0.7.1...v0.7.3)

Signed-off-by: dependabot[bot] <[email protected]>

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

Author: dependabot[bot]

Diff for: poetry.lock

@@ -46,7 +46,7 @@ pdoc3 = "^0.9.2"
 pytest-asyncio = "^0.15.1"
 bandit = "^1.7.0"
 radon = "^4.5.0"
-xenon = "^0.7.1"
+xenon = "^0.7.3"
 flake8-eradicate = "^1.0.0"
 flake8-bugbear = "^21.3.2"
 mkdocs-material = "^7.1.6"