Pin urllib3, bump requests and boto3 due to OpenSSL issue

[branyip]

Travis hit a build error after #174 was merged into master. This error wasn't seen before in the feature branch, but appeared during the deploy step in master.

ImportError: urllib3 v2.0 only supports OpenSSL 1.1.1+, currently the 'ssl' module is compiled with 'OpenSSL 1.0.2g 1 Mar 2016'. See: https://github.com/urllib3/urllib3/issues/2168

• It looks like we need to pin urllib3 to < 2.0. This change pins it to v1.26.16 as it's the latest version available that's < v2.0.

  • https://github.com/urllib3/urllib3/tags

• requests and boto3 (by way of botocore)also needed to be bumped because they had incompatible urllib3 version requirements.

  • https://github.com/psf/requests/blob/v2.27.1/setup.py#LL48C5-L48C28
  • https://github.com/boto/botocore/blob/1.23.10/setup.py#L28

• urllib3 v2.0.3 was being install via twine

  Collecting urllib3>=1.26.0 (from twine)
  Downloading urllib3-2.0.3-py3-none-any.whl (123 kB)

  • The newly pinned version still satisfies this requirement