build(deps): update importlib-metadata requirement (#188)

Updates the requirements on [importlib-metadata](https://github.com/python/importlib_metadata) to permit the latest version.
- [Release notes](https://github.com/python/importlib_metadata/releases)
- [Changelog](https://github.com/python/importlib_metadata/blob/main/CHANGES.rst)
- [Commits](python/importlib_metadata@v1.6.0...v5.2.0)

---
updated-dependencies:
- dependency-name: importlib-metadata
  dependency-type: direct:production
...

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pyproject.toml

@@ -17,7 +17,7 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = "^3.7.0"
-importlib_metadata = { version = ">=1.6,<5.0", python = "<3.8" }
+importlib_metadata = { version = ">=1.6,<6.0", python = "<3.8" }
 py-moneyed = { version = ">=0.8", optional = true }
 
 [tool.poetry.extras]