Bump coverage[toml] from 7.13.3 to 7.13.4 in /core

Bumps [coverage[toml]](https://github.com/coveragepy/coveragepy) from 7.13.3 to 7.13.4.
- [Release notes](https://github.com/coveragepy/coveragepy/releases)
- [Changelog](https://github.com/coveragepy/coveragepy/blob/main/CHANGES.rst)
- [Commits](coveragepy/coveragepy@7.13.3...7.13.4)

---
updated-dependencies:
- dependency-name: coverage[toml]
  dependency-version: 7.13.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

core/pyproject.toml

@@ -62,7 +62,7 @@ classifiers = [
 # Extras used by developers *of* Toga are pinned to specific versions to
 # ensure environment consistency.
 test = [
-    "coverage[toml] == 7.13.3",
+    "coverage[toml] == 7.13.4",
     "coverage-conditional-plugin == 0.9.0",
     "Pillow == 12.1.0",
     "pytest == 9.0.2",