Bump invoke from 1.5.0 to 1.6.0

Bumps [invoke](https://github.com/bitprophet/alabaster) from 1.5.0 to 1.6.0.
- [Release notes](https://github.com/bitprophet/alabaster/releases)
- [Changelog](https://github.com/bitprophet/alabaster/blob/master/docs/changelog.rst)
- [Commits](https://github.com/bitprophet/alabaster/commits)

---
updated-dependencies:
- dependency-name: invoke
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

poetry.lock

@@ -14,7 +14,7 @@ python = "^3.9"
 black = "^21.6b0"
 codespell = "^2.1.0"
 flake8 = "^3.9.2"
-invoke = "^1.5.0"
+invoke = "^1.6.0"
 pep8-naming = "^0.12.0"
 pytest = "^6.2.4"