Update dependency urllib3 to v1.26.8

This MR contains the following updates:

Package	Type	Update	Change
urllib3 (source)	ironbank-pypi	patch	1.26.7 -> 1.26.8

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Release Notes

urllib3/urllib3

v1.26.8

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⚠ urllib3 v2.0 will drop support for Python 2: Read more in the v2.0 Roadmap

⚠ This release will be the last release supporting Python 3.5. Please upgrade to a non-EOL Python version.

• Added extra message tourllib3.exceptions.ProxyError when urllib3 detects that a proxy is configured to use HTTPS but the proxy itself appears to only use HTTP.
• Added a mention of the size of the connection pool when discarding a connection due to the pool being full.
• Added explicit support for Python 3.11.
• Deprecated the Retry.MAX_BACKOFF class property in favor of Retry.DEFAULT_MAX_BACKOFF to better match the rest of the default parameter names. Retry.MAX_BACKOFF is removed in v2.0.
• Changed location of the vendored ssl.match_hostname function from urllib3.packages.ssl_match_hostname to urllib3.util.ssl_match_hostname to ensure Python 3.10+ compatibility after being repackaged by downstream distributors.
• Fixed absolute imports, all imports are now relative.

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