isort: Configure to use single lines

pyproject.toml:
Configure isort to use single lines (one line for each import) to ease
merge conflicts.

keyringctl:
Reformat using new isort settings.

keyringctl

@@ -5,15 +5,32 @@
 from argparse import ArgumentParser
 from collections import defaultdict
 from contextlib import contextmanager
-from logging import DEBUG, basicConfig, debug, error
+from logging import DEBUG
-from os import chdir, getcwd
+from logging import basicConfig
+from logging import debug
+from logging import error
+from os import chdir
+from os import getcwd
 from pathlib import Path
-from re import escape, split, sub
+from re import escape
+from re import split
+from re import sub
 from shutil import copytree
-from subprocess import PIPE, CalledProcessError, check_output
+from subprocess import PIPE
-from sys import exit, stderr
+from subprocess import CalledProcessError
-from tempfile import TemporaryDirectory, mkdtemp
+from subprocess import check_output
-from typing import Dict, Iterable, Iterator, List, Optional, Set, Tuple, Union
+from sys import exit
+from sys import stderr
+from tempfile import TemporaryDirectory
+from tempfile import mkdtemp
+from typing import Dict
+from typing import Iterable
+from typing import Iterator
+from typing import List
+from typing import Optional
+from typing import Set
+from typing import Tuple
+from typing import Union
 
 
 @contextmanager

pyproject.toml

@@ -33,6 +33,7 @@ omit = ["tests/*", ".tox/*"]
 [tool.isort]
 profile = "black"
 multi_line_output = 3
+force_single_line = true
 
 [tool.mypy]
 ignore_missing_imports = true