chore(dependencies): update dependency codecov to ^2.1.9

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
codecov	dev-dependencies	patch	^2.1.3 -> ^2.1.9

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Release Notes

codecov/codecov-python

v2.1.9

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• #​289Remove token restriction as it is changed server-side

v2.1.8

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• #​285Add support for CODECOV_FLAGS
• #​276Add ability to specify number of upload retries

v2.1.7

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• #​279 Fix pinned coverage version

v2.1.6

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• #​275 Fix GitHub Actions implementation

v2.1.5

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• #​273 Implement retries on Codecov API calls
• #​265 Add GitHub Actions CI detection
• #​267 Add CODECOV_NAME as default for name

v2.1.4

• #​260 Enforce black formatting
• #​169 Fix command line quoting on Windows
• #​216 Fix GitLab CI project directory detection on Windows
• #​264 Fix GitLab CI post version 9
• #​262 Check text for NoneType on writes
• #​266 Include the cacert in the PUT call when uploading to S3
• #​263 Fixed gcov not being found in certain instances

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