Update dependency freezegun to v0.3.15

This MR contains the following updates:

Package	Update	Change
freezegun	patch	==0.3.11 -> ==0.3.15

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Release Notes

spulec/freezegun

v0.3.15

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• Fix locale timestamp bug. CC #​328

v0.3.14

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• Fix calendar.timegm behavior

v0.3.13

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• Fix for Py3.8
• Reset time.time_ns on stop

v0.3.12

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• Refactor classes to functions
• Ignore Selenium
• Move to pytest
• Conditionally patch time.clock
• Patch time.time_ns added in Python 3.7

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