Update apache-libcloud requirement from <3.8,>=3.6 to >=3.6,<3.9 (#99)

Updates the requirements on [apache-libcloud](https://github.com/apache/libcloud) to permit the latest version.
- [Changelog](https://github.com/apache/libcloud/blob/trunk/CHANGES.rst)
- [Commits](apache/libcloud@v3.6.0...v3.8.0)

---
updated-dependencies:
- dependency-name: apache-libcloud
  dependency-type: direct:production
...

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

pyproject.toml

@@ -31,7 +31,7 @@ classifiers = [
 ]
 dependencies = [
     "SQLAlchemy >=1.4, <2.1",
-    "apache-libcloud >=3.6, <3.8",
+    "apache-libcloud >=3.6, <3.9",
 ]
 dynamic = ["version"]