chore(deps): refresh to current, and remove two constraints holding it back

pyproject.toml

@@ -12,7 +12,10 @@ dependencies = [
     "uvicorn>=0.30.0,<1",
     "httpx>=0.27.0,<1",
     "python-multipart>=0.0.9,<1",
-    "python-dotenv==1.0.0",
+    # Range, not an exact pin. This sat at ==1.0.0 while 1.2.2 was current; an
+    # exact pin on a transitive-safe library is a stale-dependency risk with no
+    # upside, since nothing here depends on dotenv internals.
+    "python-dotenv>=1.2.2,<2",
     "pydub>=0.25.1,<0.26",
     "sounddevice>=0.5.2,<0.6",
     "mutagen>=1.47.0",
@@ -25,8 +28,12 @@ package = false
 [dependency-groups]
 dev = [
     "aiohttp>=3.9.0",
-    "pytest>=8.0",
-    "pytest-asyncio>=0.23,<1.0",
+    "pytest>=9.1",
+    # The <1.0 cap held this at 0.26 while 1.4 was current. 1.0 is the release
+    # that made asyncio_mode/loop-scope settings mandatory rather than warned
+    # about; this project already sets all three in [tool.pytest.ini_options],
+    # so it was capped below a release it was already compatible with.
+    "pytest-asyncio>=1.4,<2",
     # scripts/ only, for stt/client.py's sync STTClient. DO NOT promote to
     # [project] dependencies: the async app must never ship the sync
     # websocket-client path again (see test_websocket_client_not_a_runtime_dep).