Update h11 requirement from <0.10,>=0.8 to >=0.8,<0.11 (#209)

Updates the requirements on [h11](https://github.com/python-hyper/h11) to permit the latest version.
- [Release notes](https://github.com/python-hyper/h11/releases)
- [Commits](python-hyper/h11@v0.8.0...v0.10.0)

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

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

Author: dependabot[bot]

setup.py

@@ -53,7 +53,7 @@ def get_packages(package):
     packages=get_packages("httpcore"),
     include_package_data=True,
     zip_safe=False,
-    install_requires=["h11>=0.8,<0.10", "sniffio==1.*"],
+    install_requires=["h11>=0.8,<0.11", "sniffio==1.*"],
     extras_require={
         "http2": ["h2>=3,<5"],
     },