ci: pin riot and fix starlette tests [backport #5304 to 1.8] (#5309)

backports: #5304

## Checklist

- [x] Change(s) are motivated and described in the PR description.
- [x] Testing strategy is described if automated tests are not included
in the PR.
- [x] Risk is outlined (performance impact, potential for breakage,
maintainability, etc).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] [Library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/contributing.html#Release-Note-Guidelines)
are followed.
- [x] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/)).
- [x] Author is aware of the performance implications of this PR as
reported in the benchmarks PR comment.

## Reviewer Checklist

- [ ] Title is accurate.
- [ ] No unnecessary changes are introduced.
- [ ] Description motivates each change.
- [ ] Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes unless absolutely necessary.
- [ ] Testing strategy adequately addresses listed risk(s).
- [ ] Change is maintainable (easy to change, telemetry, documentation).
- [ ] Release note makes sense to a user of the library.
- [ ] Reviewer is aware of, and discussed the performance implications
of this PR as reported in the benchmarks PR comment.

Author: mabdinur

.circleci/config.yml

@@ -68,7 +68,7 @@ commands:
     description: "Install riot"
     steps:
       # Make sure we install and run riot on Python 3
-      - run: pip3 install riot
+      - run: pip3 install riot==0.16.0
 
   restore_tox_cache:
     description: "Restore .tox directory from previous runs for faster installs"

scripts/ddtest

@@ -12,7 +12,7 @@ fi
 # retry docker pull if fails
 for i in {1..3}; do docker-compose pull -q testrunner && break || sleep 3; done
 
-FULL_CMD="pip install -q --disable-pip-version-check riot tox && $CMD"
+FULL_CMD="pip install -q --disable-pip-version-check riot==0.16.0 tox && $CMD"
 
 # install and upgrade tox and riot in case testrunner image has not been updated
 # DEV: Use `--no-TTY` and `--quiet-pull` when running in CircleCI

tests/contrib/starlette/test_starlette.py

@@ -24,7 +24,7 @@
 
 
 starlette_version_str = getattr(starlette, "__version__", "0.0.0")
-starlette_version = tuple([int(i) for i in starlette_version_str.split(".")])
+starlette_version = tuple([int(i) for i in starlette_version_str.split(".")[:3]])
 
 
 @pytest.fixture