Update importlib-metadata requirement from <7 to <9

Updates the requirements on [importlib-metadata](https://github.com/python/importlib_metadata) to permit the latest version.
- [Changelog](https://github.com/python/importlib_metadata/blob/main/NEWS.rst)
- [Commits](python/importlib_metadata@0.1...v8.7.1)

---
updated-dependencies:
- dependency-name: importlib-metadata
  dependency-version: 8.7.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -23,7 +23,7 @@ docs = ["Sphinx", "sphinx-rtd-theme"]
 
 [tool.poetry.group.dev.dependencies]
 bandit = "^1.7.0"
-importlib-metadata = "<7" # Workaround for https://github.com/PyCQA/bandit/issues/951
+importlib-metadata = "<9" # Workaround for https://github.com/PyCQA/bandit/issues/951
 isort = "^5.7.0" 
 lxml = "^5.2.2" 
 mypy = "^1.1"