build(deps): bump coverage from 7.3.2 to 7.3.4 in /requirements

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.3.2 to 7.3.4.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.3.2...7.3.4)

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

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

requirements/_tests.txt

@@ -1,7 +1,7 @@
 # NOTE: the upper bound for the package version is only set for CI stability, and it is dropped while installing this package
 #  in case you want to preserve/enforce restrictions on the latest compatible version, add "strict" as an in-line comment
 
-coverage ==7.3.2
+coverage ==7.3.4
 pytest ==7.4.3
 pytest-cov ==4.1.0
 pytest-doctestplus ==1.1.0