Update environs requirement from ^9.5.0 to >=9.5,<11.0 (#7)

Updates the requirements on [environs](https://github.com/sloria/environs) to permit the latest version.
- [Changelog](https://github.com/sloria/environs/blob/master/CHANGELOG.md)
- [Commits](sloria/environs@9.5.0...10.0.0)

---
updated-dependencies:
- dependency-name: environs
  dependency-type: direct:production
...

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

pyproject.toml

@@ -12,7 +12,7 @@ sinker = "sinker.__main__:main"
 [tool.poetry.dependencies]
 python = "^3.9"
 elasticsearch = "^8.6.1"
-environs = "^9.5.0"
+environs = ">=9.5,<11.0"
 psycopg = "^3.1.8"
 pytest-mock = "^3.10.0"