Add ruff exclusions to pyproject.toml (pylint-dev#2537)

This makes it easier to run 'ruff check' outside of the pre-commit
hook.

Co-authored-by: Pierre Sassoulas <[email protected]>

Author: correctmost

.pre-commit-config.yaml

@@ -13,7 +13,6 @@ repos:
     rev: "v0.6.3"
     hooks:
       - id: ruff
-        exclude: tests/testdata
         args: ["--fix"]
   - repo: https://github.com/Pierre-Sassoulas/copyright_notice_precommit
     rev: 0.1.2

pyproject.toml

@@ -98,6 +98,8 @@ ignore_missing_imports = true
 [tool.ruff]
 target-version = "py39"
 
+exclude = ["tests/testdata/"]
+
 # ruff is less lenient than pylint and does not make any exceptions
 # (for docstrings, strings and comments in particular).
 line-length = 110