Bump urllib3 from 1.26.15 to 1.26.16

[dependabot[bot]]

Bumps urllib3 from 1.26.15 to 1.26.16.

Release notes

Sourced from urllib3's releases.

1.26.16

• Fixed thread-safety issue where accessing a PoolManager with many distinct origins would cause connection pools to be closed while requests are in progress (#2954)

Changelog

Sourced from urllib3's changelog.

1.26.16 (2023-05-23)

• Fixed thread-safety issue where accessing a PoolManager with many distinct origins would cause connection pools to be closed while requests are in progress ([#2954](https://github.com/urllib3/urllib3/issues/2954) <https://github.com/urllib3/urllib3/pull/2954>_)

Commits

• d94029b Release 1.26.16
• 18e9214 Use trusted publishing for PyPI
• d25cf83 [1.26] Fix invalid test_ssl_failure_midway_through_conn
• 25cca38 [1.26] Fix test_ssl_object_attributes
• bbea166 [1.26] Fix pypy2.7 CI
• 710114d [1.26] Don't close ConnectionPools from PoolManager until unreferenced
• 6b77c39 [1.26] pin virtualenv to <20.22.0 for python-version==2.7
• cdb8a7d [1.26] Fix compatible Python versions in v2-roadmap.rst (#2979)
• 0dfbb25 [1.26] Bump Ubuntu version in integration tests
• f50c0d0 [1.26] Fix isort pre-commit installation
• Additional commits viewable in compare view

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[jshcodes]

@dependabot rebase

[dependabot[bot]]

Looks like urllib3 is up-to-date now, so this is no longer needed.