chore: bump invoke from 1.6.0 to 1.7.3 in /tests

Bumps [invoke](https://github.com/pyinvoke/invoke) from 1.6.0 to 1.7.3.
- [Release notes](https://github.com/pyinvoke/invoke/releases)
- [Commits](https://github.com/pyinvoke/invoke/compare/1.6.0...1.7.3)

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

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

tests/requirements_py3.txt

@@ -7,7 +7,7 @@ cryptography==38.0.1
 filelock==3.8.0
 idna==3.4
 iniconfig==1.1.1
-invoke==1.6.0
+invoke==1.7.3
 packaging==21.3
 pathlib2==2.3.7.post1
 pluggy==1.0.0