Update dependency certifi to v2020.12.5

This MR contains the following updates:

Package	Type	Update	Change
certifi	ironbank-pypi	minor	2020.6.20 -> 2020.12.5
certifi		minor	==2020.6.20 -> ==2020.12.5

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Release Notes

certifi/python-certifi

v2020.12.5

Compare Source

v2020.11.8

Compare Source

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