Apply repo-review suggestion RF003

RF003: src directory doesn't need to be specified anymore (0.6+)

Ruff now (0.6+) looks in the src directory by default. The src
setting doesn't need to be specified if it's just set to `["src"]`.

Author: DimitriPapadopoulos

pyproject.toml

@@ -61,9 +61,6 @@ version.source = "vcs"
 
 [tool.ruff]
 line-length = 121
-src = [
-  "src",
-]
 lint.extend-select = [
   "A",
   "B",