Bump invoke from 1.7.1 to 1.7.3 (#219)

Bumps [invoke](https://github.com/pyinvoke/invoke) from 1.7.1 to 1.7.3.
- [Release notes](https://github.com/pyinvoke/invoke/releases)
- [Commits](pyinvoke/invoke@1.7.1...1.7.3)

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

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,3 +1,3 @@
 cffi==1.15.1
-invoke==1.7.1
+invoke==1.7.3
 pycparser==2.21