Update approvaltests requirement from >=11.1.1 to >=17.4.3

Updates the requirements on [approvaltests](https://github.com/approvals/ApprovalTests.Python) to permit the latest version.
- [Release notes](https://github.com/approvals/ApprovalTests.Python/releases)
- [Commits](approvals/ApprovalTests.Python@v11.1.1...v17.4.3)

---
updated-dependencies:
- dependency-name: approvaltests
  dependency-version: 17.4.3
  dependency-type: direct:development
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -13,4 +13,4 @@ rellu >= 0.7
 twine
 wheel
 typing-extensions >= 4.5.0
-approvaltests >= 11.1.1
+approvaltests >= 17.4.3