py(deps[dev]): Require ruff>=0.16.0

why: ruff 0.16.0 stabilizes rules inside prefixes this project already
selects and starts formatting Python code blocks in Markdown. Pinning a
floor keeps contributors and CI on the same diagnostics instead of
splitting on whatever ruff each machine resolved.

what:
- Raise `ruff` to `>=0.16.0` in the `dev` and `lint` dependency groups
- Relock `uv.lock`: ruff 0.15.22 -> 0.16.0

https://astral.sh/blog/ruff-v0.16.0

Author: tony

pyproject.toml

@@ -75,7 +75,7 @@ dev = [
   "coverage",
   "pytest-cov",
   # Lint
-  "ruff",
+  "ruff>=0.16.0",
   "mypy",
   # Type stubs
   "types-docutils",
@@ -104,7 +104,7 @@ coverage =[
   "pytest-cov",
 ]
 lint = [
-  "ruff",
+  "ruff>=0.16.0",
   "mypy",
 ]