deps: update coverage requirement from ~=7.13 to ~=7.15

Updates the requirements on [coverage](https://github.com/coveragepy/coveragepy) to permit the latest version.
- [Release notes](https://github.com/coveragepy/coveragepy/releases)
- [Changelog](https://github.com/coveragepy/coveragepy/blob/main/CHANGES.rst)
- [Commits](coveragepy/coveragepy@7.13.0...7.15.2)

---
updated-dependencies:
- dependency-name: coverage
  dependency-version: 7.15.2
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -49,7 +49,7 @@ lint = [
 ]
 test = [
     "pytest~=9.0",
-    "coverage[toml]~=7.13"
+    "coverage[toml]~=7.15"
 ]
 docs = [
     "mkdocs-material~=9.5",