chore: Require minimum urllib3 1.26.0 version

[tembleking]

For versions lower than 1.26.0, this error arises:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.9/dist-packages/sdcclient/_monitor.py", line 11, in __init__
    super(SdMonitorClient, self).__init__(token, sdc_url, ssl_verify, custom_headers)
  File "/usr/local/lib/python3.9/dist-packages/sdcclient/monitor/_dashboards_v3.py", line 14, in __init__
    super(DashboardsClientV3, self).__init__(token, sdc_url, ssl_verify, custom_headers)
  File "/usr/local/lib/python3.9/dist-packages/sdcclient/monitor/_events_v2.py", line 9, in __init__
    super().__init__(token, sdc_url, ssl_verify, custom_headers)
  File "/usr/local/lib/python3.9/dist-packages/sdcclient/_common.py", line 55, in __init__
    adapter = SysdigHTTPAdapter(ssl_verify=self.ssl_verify)
  File "/usr/local/lib/python3.9/dist-packages/sdcclient/_common.py", line 11, in __init__
    retry_strategy = Retry(
TypeError: __init__() got an unexpected keyword argument 'allowed_methods'