Update bandit requirement from >=1.5.1 to >=1.8.6 (#212)

Updates the requirements on [bandit](https://github.com/PyCQA/bandit) to permit the latest version.
- [Release notes](https://github.com/PyCQA/bandit/releases)
- [Commits](PyCQA/bandit@1.5.1...1.8.6)

---
updated-dependencies:
- dependency-name: bandit
  dependency-version: 1.8.6
  dependency-type: direct:development
...

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Author: dependabot[bot]

dev-requirements.txt

@@ -5,6 +5,6 @@ opem==1.4
 PyQt5==5.15.11
 PyQt5-sip==12.17.1
 setuptools>=40.8.3
-bandit>=1.5.1
+bandit>=1.8.6
 vulture>=1.0
 pydocstyle>=6.3.0