Update Ruff configuration

This resolves two warnings about Ruff configuration, by:

- No longer setting `ignore-init-module-imports = true` explicitly,
  which was deprecated since `ruff` 0.4.4. We primarily use `ruff`
  via `pre-commit`, for which this deprecation has applied since we
  upgraded the version in `.pre-commit-config.yaml` from 0.4.3 to
  0.6.0 in d1582d1 (#1953).

  We continue to list `F401` ("Module imported but unused") as not
  automatically fixable, to avoid inadvertently removing imports
  that may be needed.

  See also:
  https://docs.astral.sh/ruff/settings/#lint_ignore-init-module-imports

- Rename the rule `TCH004` to `TC004`, since `TCH004` is the old
  name that may eventually be removed and that is deprecated since
  0.8.0. We upgraded `ruff` in `.pre-commit-config.yml` again in
  b7ce712 (#2031), from 0.6.0 to 0.11.12, at which point this
  deprecation applied.

  See also https://astral.sh/blog/ruff-v0.8.0.

These changes make those configuration-related warnings go away,
and no new diagnostics (errors/warnings) are produced when running
`ruff check` or `pre-commit run --all-files`. No F401-related
diagnostics are triggered when testing with explicit
`ignore-init-module-imports = false`, in preview mode or otherwise.

In addition, this commit makes two changes that are not needed to
resolve warnings:

- Stop excluding `E203` ("Whitespace before ':'"). That diagnostic
  is no longer failing with the current code here in the current
  version of `ruff`, and code changes that would cause it to fail
  would likely be accidentally mis-st

- Add the version lower bound `>=0.8` for `ruff` in
  `requirements-dev.txt`. That file is rarely used, as noted in
  a8a73ff (#1871), but as long as we have it, there may be a
  benefit to excluding dependency versions for which our
  configuration is no longer compatible. This is the only change in
  this commit outside of `pyproject.toml`.

pyproject.toml

@@ -60,16 +60,14 @@ lint.select = [
     # "UP",  # See: https://docs.astral.sh/ruff/rules/#pyupgrade-up
 ]
 lint.extend-select = [
-    # "A",     # See: https://pypi.org/project/flake8-builtins
-    "B",       # See: https://pypi.org/project/flake8-bugbear
-    "C4",      # See: https://pypi.org/project/flake8-comprehensions
-    "TCH004",  # See: https://docs.astral.sh/ruff/rules/runtime-import-in-type-checking-block/
+    # "A",    # See: https://pypi.org/project/flake8-builtins
+    "B",      # See: https://pypi.org/project/flake8-bugbear
+    "C4",     # See: https://pypi.org/project/flake8-comprehensions
+    "TC004",  # See: https://docs.astral.sh/ruff/rules/runtime-import-in-type-checking-block/
 ]
 lint.ignore = [
-    "E203",  # Whitespace before ':'
     "E731",  # Do not assign a `lambda` expression, use a `def`
 ]
-lint.ignore-init-module-imports = true
 lint.unfixable = [
     "F401",  # Module imported but unused
 ]

requirements-dev.txt

@@ -2,7 +2,7 @@
 -r test-requirements.txt
 
 # For additional local testing/linting - to be added elsewhere eventually.
-ruff
+ruff >=0.8
 shellcheck
 pytest-icdiff
 # pytest-profiling