Update testcontainers requirement from <4.8,>=3.7 to >=3.7,<4.9 (#14)

Updates the requirements on [testcontainers](https://github.com/testcontainers/testcontainers-python) to permit the latest version.
- [Release notes](https://github.com/testcontainers/testcontainers-python/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-python/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-python@testcontainers-v4.0.0...testcontainers-v4.8.0)

---
updated-dependencies:
- dependency-name: testcontainers
  dependency-type: direct:development
...

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

setup.py

@@ -27,7 +27,7 @@
     install_requires=["dbt-duckdb>=1.6"],
     extras_require={
         "airflow": ["apache-airflow"],
-        "test": ["testcontainers>=3.7,<4.8"],
+        "test": ["testcontainers>=3.7,<4.9"],
     },
     python_requires='>=3.8'
 )