Bump coverage from 5.5 to 6.3.2 (encode#1432)

Bumps [coverage](https://github.com/nedbat/coveragepy) from 5.5 to 6.3.2.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@coverage-5.5...6.3.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

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

requirements.txt

@@ -19,7 +19,7 @@ types-click==7.1.8
 types-pyyaml==6.0.5
 trustme==0.9.0
 cryptography==3.4.8
-coverage==5.5
+coverage==6.3.2
 coverage-conditional-plugin==0.5.0
 httpx==1.0.0b0
 pytest-asyncio==0.15.1