pip(deps): update coverage[toml] requirement from ~=6.1 to ~=6.3

Updates the requirements on [coverage[toml]](https://github.com/nedbat/coveragepy) to permit the latest version.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@6.1...6.3.2)

---
updated-dependencies:
- dependency-name: coverage[toml]
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements/DEV_REQUIREMENTS.txt

@@ -1,7 +1,7 @@
 black~=22.1 ; python_version >= '3.7'
 black~=21.4b0 ; python_version == '3.6'
 coveralls~=3.3
-coverage[toml]~=6.1
+coverage[toml]~=6.3
 isort~=5.10
 moto~=3.1
 pydoc-markdown~=4.3, < 4.6.* ; python_version >= '3.7'