chore: bump watchfiles (#2733)

We can't upgrade to python 3.14 because the `watchfiles` dependency was
pinned below 1.0.0 and support was added in 1.1.0.

This was attempted to be fixed in #2680 but they're unresponsive so this
will supersede that PR.

Author: hayescode

backend/pyproject.toml

@@ -48,7 +48,7 @@ dependencies = [
     "tomli>=2.0.1,<3.0.0",
     "pydantic>=2.7.2,<3",
     "python-dotenv>=1.0.0,<2.0.0",
-    "watchfiles>=0.20.0,<1.0.0",
+    "watchfiles>=1.1.1,<2.0.0",
     "filetype>=1.2.0,<2.0.0",
     "lazify>=0.4.0,<0.5.0",
     "packaging>=23.1",