[AI-5184] pin urllib3

[sarah-witt]

What does this PR do?

pins urllib3, a transitive dep of requests that we sometimes use

Motivation

we use it here:

integrations-core/datadog_checks_base/datadog_checks/base/__init__.py

Line 8 in d44b9cb

if __getattr__('datadog_agent').get_config('use_boringssl'):

and here https://github.com/DataDog/integrations-core/blob/master/datadog_checks_base/datadog_checks/base/log.py#L166-L170

and https://github.com/DataDog/integrations-core/blob/master/datadog_checks_base/datadog_checks/base/utils/http.py#L20

if they reorganize their imports/package structure that could potentially break things for us

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.70%. Comparing base (7380f75) to head (a16ccef).
Report is 66 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
datadog_checks_base	89.40% <ø> (+0.37%)	⬆️
hive	?
hivemq	?
hudi	?
ignite	?
jboss_wildfly	?
kafka	?
presto	?
solr	?

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