Pin Redis version to < 4.0.0 (#20430)

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## Why are these changes needed?

This pin is needed to fix `test_output` on master, which broke when 4.0.0 was released. 

It may also fix the windows build (unsure). 

## Related issue number

<!-- For example: "Closes #1234" -->

## Checks

- [ ] I've run `scripts/format.sh` to lint the changes in this PR.
- [ ] I've included any doc changes needed for https://docs.ray.io/en/master/.
- [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
- Testing Strategy
   - [ ] Unit tests
   - [ ] Release tests
   - [ ] This PR is not tested :(

python/requirements.txt

@@ -23,7 +23,7 @@ protobuf >= 3.8.0
 py-spy >= 0.2.0
 pydantic >= 1.8
 pyyaml
-redis >= 3.5.0
+redis >= 3.5.0, < 4.0.0
 requests
 
 ## setup.py extras

python/setup.py

@@ -264,7 +264,7 @@ def get_packages(self):
         "numpy >= 1.19.3; python_version >= '3.9'",
         "protobuf >= 3.15.3",
         "pyyaml",
-        "redis >= 3.5.0",
+        "redis >= 3.5.0, < 4.0.0",
     ]