chore: bump assertthat from 6.3.0 to 6.3.1 (#308)

Bumps [assertthat](https://github.com/thenativeweb/assertthat) from 6.3.0 to 6.3.1.
- [Release notes](https://github.com/thenativeweb/assertthat/releases)
- [Changelog](https://github.com/thenativeweb/assertthat/blob/main/CHANGELOG.md)
- [Commits](thenativeweb/assertthat@6.3.0...6.3.1)

---
updated-dependencies:
- dependency-name: assertthat
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

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

package.json

@@ -18,7 +18,7 @@
  "defekt": "7.2.0"
  },
  "devDependencies": {
- "assertthat": "6.3.0",
+ "assertthat": "6.3.1",
  "roboter": "11.7.1",
  "semantic-release-configuration": "2.0.1"
  },