Switch to ruff format (#14)

Signed-off-by: William Woodruff <william@trailofbits.com>

Makefile

@@ -36,14 +36,14 @@ $(VENV)/pyvenv.cfg: pyproject.toml
 .PHONY: lint
 lint: $(VENV)/pyvenv.cfg
 	. $(VENV_BIN)/activate && \
-		black --preview --check $(ALL_PY_SRCS) && \
+		ruff format --check $(ALL_PY_SRCS) && \
 		ruff $(ALL_PY_SRCS) && \
 		mypy $(PY_MODULE)
 
 .PHONY: reformat
-reformat:
+reformat: $(VENV)/pyvenv.cfg
 	. $(VENV_BIN)/activate && \
-		black --preview $(ALL_PY_SRCS) && \
+		ruff format $(ALL_PY_SRCS) && \
 		ruff --fix $(ALL_PY_SRCS)
 
 .PHONY: doc

pyproject.toml

@@ -22,7 +22,6 @@ requires-python = ">=3.8"
 [project.optional-dependencies]
 doc = ["pdoc"]
 lint = [
-    "black >= 22.3.0",
     # NOTE: ruff is under active development, so we pin conservatively here
     # and let Dependabot periodically perform this update.
     "ruff < 0.1.8",
@@ -40,8 +39,6 @@ Documentation = "https://trailofbits.github.io/sigstore-rekor-types/"
 Issues = "https://github.com/trailofbits/sigstore-rekor-types/issues"
 Source = "https://github.com/trailofbits/sigstore-rekor-types"
 
-[tool.black]
-line-length = 100
 
 [tool.mypy]
 allow_redefinition = true