Modify clearml-agent to accept urlib>=2 as a dependency.

[jday1]

urlib3 is limited to v1 (urllib3>=1.21.1,<1.27.0).

Hopefully, this can be modified to something like urllib3>=1.21.1,<2.0.7.

Pytorch lightning's standard for this is urllib3<4.0.

See PR: #172

[benglewis]

Please can you release the urllib3 requirement or increase the upper version limit if necessary. This is such a strange restriction

[jkhenning]

Hi @benglewis, there's an open PR for this, and we basically just want to make sure this will not break anything.