dep: bump simplecov from 0.21.0 to 0.21.1

Bumps simplecov from 0.21.0 to 0.21.1.

Release notes

Sourced from simplecov's releases.

v0.21.1

Bugfixes

• minimum_coverage_by_file works again as expected (errored out before 😱)

Changelog

Sourced from simplecov's changelog.

0.21.1 (2021-01-04)

Bugfixes

• minimum_coverage_by_file works again as expected (errored out before 😱)

Commits

• 120d0ea Fix minimum_coverage_by_file check & prep 0.21.1 (#966)
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