Revert "Update to Uvicorn 0.34.0"

This reverts commit 3cdf61e.

After updating from Uvicorn 0.28.1 to Uvicorn >=0.29.0, coverage.py
reports that `inboard.gunicorn_workers.UvicornWorker.callback_notify`
and the test ASGI app (`tests.test_gunicorn_workers.app`) are not being
covered when they actually are covered by the tests. `callback_notify`
runs after the Gunicorn server has started up, and the test ASGI app
is obviously used (otherwise the tests couldn't pass).

Possibly related to the unexpected change in test coverage, coverage.py
is generating less coverage files with Uvicorn >=0.29.0. This could
suggest that some of the subprocesses used in the tests aren't exiting
cleanly or aren't being detected by coverage.py. Signal handling has
changed substantially in Uvicorn >=0.29.0, but those changes haven't
been tested with the workers because Uvicorn doesn't test its workers,
as noted in 35d8d86.

Until the changes to signal handling and test coverage are understood
more clearly, Uvicorn will remain on version 0.28.1.

inboard/types.py

@@ -136,7 +136,7 @@ class UvicornOptions(TypedDict, total=False):
     limit_max_requests: int | None
     timeout_keep_alive: int
     timeout_graceful_shutdown: int | None
-    ssl_keyfile: str | PathLike[str] | None
+    ssl_keyfile: str | None
     ssl_certfile: str | PathLike[str] | None
     ssl_keyfile_password: str | None
     ssl_version: int

pyproject.toml

@@ -22,7 +22,7 @@ classifiers = [
 ]
 dependencies = [
   "gunicorn==22.0.0",
-  "uvicorn==0.34.0",
+  "uvicorn==0.28.1",
 ]
 description = "Docker images and utilities to power your Python APIs and help you ship faster."
 dynamic = ["version"]
@@ -56,12 +56,12 @@ tests = [
   "trustme>=1.2,<2",
 ]
 uvicorn-fast = [
-  "httptools>=0.6.3",
+  "httptools>=0.5.0",
   "uvloop>=0.14.0,!=0.15.0,!=0.15.1; sys_platform != 'win32' and (sys_platform != 'cygwin' and platform_python_implementation != 'PyPy')",
   "websockets>=10.4",
 ]
 uvicorn-standard = [
-  "uvicorn[standard]==0.34.0",
+  "uvicorn[standard]==0.28.1",
 ]
 
 [project.urls]