build(deps): update ruff requirement from <0.7.5 to <0.8.1 (#105)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -24,7 +24,7 @@ doc = ["pdoc >= 14.2,< 16.0"]
 lint = [
     # NOTE: ruff is under active development, so we pin conservatively here
     # and let Dependabot periodically perform this update.
-    "ruff < 0.7.5",
+    "ruff < 0.8.1",
     "mypy >= 1.0",
 ]
 codegen = ["datamodel-code-generator>=0.25.2", "sigstore-rekor-types[lint]"]