Bump coverage from 6.1.1 to 6.1.2 (#6297)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 6.1.1 to 6.1.2.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](coveragepy/coveragepy@6.1.1...6.1.2)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements/test.txt

@@ -1,6 +1,6 @@
 -r base.txt
 Brotli==1.0.9
-coverage==6.1.1
+coverage==6.1.2
 cryptography==35.0.0; platform_machine!="i686" # no 32-bit wheels; no python 3.9 wheels yet
 freezegun==1.1.0
 mypy==0.910; implementation_name=="cpython"