ci: fix lint findings and refine ruff rules

Author: gazzycodes

pyproject.toml

@@ -39,4 +39,4 @@ line-length = 90
 target-version = "py38"
 
 [tool.ruff.lint]
-select = ["E", "F", "I", "UP", "B"]
+select = ["E", "F", "I", "B"]

src/knot/cli.py

@@ -4,7 +4,7 @@
 
 import argparse
 import sys
-from typing import List, Optional, Sequence
+from typing import Optional, Sequence
 
 from knot import __version__
 from knot.analyzer import build_graph

src/knot/render.py

@@ -77,4 +77,4 @@ def render(fmt: str, graph: ImportGraph, cycles: List[Cycle]) -> str:
     try:
         return formatters[fmt](graph, cycles)
     except KeyError:  # pragma: no cover - guarded by argparse choices
-        raise ValueError(f"unknown format: {fmt!r}")
+        raise ValueError(f"unknown format: {fmt!r}") from None