[!218][CI] Try update OmegaConf version from setup to avoid error rep…

…orted in...

# Why is the change needed?
With the new version of pip, we got the error:
```
pip._vendor.packaging.requirements.InvalidRequirement: .* suffix can only be used with `==` or `!=` operators
    PyYAML (>=5.1.*)
```

# What changes does the patch introduce?
Update the version of `omegaconf` to 2.1.1 that solves the issue, as described in: [https://github.com/facebookresearch/fairseq/issues/5436](https://github.com/facebookresearch/fairseq/issues/5436)

# How was this patch tested?
CI run

setup.py

@@ -185,7 +185,7 @@ def do_setup(package_data):
             "cython",
             'dataclasses; python_version<"3.7"',
             "hydra-core<1.1",
-            "omegaconf<2.1",
+            "omegaconf>=2.1.1",
             'numpy<1.20.0; python_version<"3.7"',
             'numpy; python_version>="3.7"',
             "regex",