Update trustme requirement from <0.8,>=0.7 to >=0.7,<0.9 (#1373)

Updates the requirements on [trustme](https://github.com/python-trio/trustme) to permit the latest version.
- [Release notes](https://github.com/python-trio/trustme/releases)
- [Commits](https://github.com/python-trio/trustme/compare/v0.7.0...v0.8.0)

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

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

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

setup.py

@@ -75,7 +75,7 @@ setup(
             "beautifulsoup4>=4.8.1,<4.10.0",
             "black==21.6b0",
             "pytest-timeout>=1.4.2,<1.5",
-            "trustme>=0.7,<0.8",
+            "trustme>=0.7,<0.9",
         ],
     },
     tests_require=["datasette[test]"],