Bump mypy from 1.5.1 to 1.6.1 (#4660)

* Bump mypy from 1.5.1 to 1.6.1

Bumps [mypy](https://github.com/python/mypy) from 1.5.1 to 1.6.1.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.5.1...v1.6.1)

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

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

* type fix

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Michael R. Crusoe <michael.crusoe@gmail.com>

requirements-dev.txt

@@ -11,7 +11,7 @@ astroid>=2.15,<3
 sphinx-autodoc-typehints>=1.24.0,<2
 sphinxcontrib-autoprogram==0.1.8
 cwltest>=2.2.20211116163652
-mypy==1.5.1
+mypy==1.6.1
 types-requests
 types-setuptools
 types-boto

src/toil/server/cli/wes_cwl_runner.py

@@ -396,7 +396,7 @@ def submit_run(client: WESClientWithWorkflowEngineParameters,
         input_file,
         attachments=attachments,
         workflow_engine_parameters=engine_options)
-    return run_result.get("run_id", None)
+    return str(run_result["run_id"])
 
 
 def poll_run(client: WESClientWithWorkflowEngineParameters, run_id: str) -> bool: