Update dependency urllib3 to v1.26.5

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
urllib3 (source)	==1.25.3 -> ==1.26.5

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	7.5	CVE-2020-7212	#229
High	7.5	CVE-2021-33503	#351

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