ci(httpx): pin tested version to v0.22.0 [0.61 branch] (#4769)

## Description

CI mitigation for issue addressed in this PR
#4595

## Reviewer Checklist
- [ ] Title is accurate.
- [ ] Description motivates each change.
- [ ] No unnecessary changes were introduced in this PR.
- [ ] Avoid breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes unless absolutely necessary.
- [ ] Tests provided or description of manual testing performed is
included in the code or PR.
- [ ] Release note has been added and follows the [library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/contributing.html#Release-Note-Guidelines),
or else `changelog/no-changelog` label added.
- [ ] All relevant GitHub issues are correctly linked.
- [ ] Backports are identified and tagged with Mergifyio.

Co-authored-by: Yun Kim <35776586+Yun-Kim@users.noreply.github.com>

riotfile.py

@@ -1411,8 +1411,7 @@ def select_pys(min_version=MIN_PYTHON_VERSION, max_version=MAX_PYTHON_VERSION):
                     "~=0.16.0",
                     "~=0.17.0",
                     "~=0.18.0",
-                    "<1.0.0",
-                    latest,
+                    "~=0.22.0",
                 ],
             },
         ),