Fix coverage pragma formatting and update diff-cover version (#2557)

Author: koxudaxi

pyproject.toml

@@ -116,7 +116,7 @@ pkg-meta = [ "check-wheel-contents>=0.6.1", "twine>=6.1", "uv>=0.5.22" ]
 coverage = [
   "covdefaults>=2.3",
   "coverage[toml]>=7.6.1",
-  "diff-cover>=7.7",
+  "diff-cover>=9.7.2",
 ]
 
 [tool.hatch]

src/datamodel_code_generator/format.py

@@ -131,8 +131,7 @@ def black_find_project_root(sources: Sequence[Path]) -> Path:
     project_root = _find_project_root(tuple(str(s) for s in sources))
     if isinstance(project_root, tuple):
         return project_root[0]
-    # pragma: no cover
-    return project_root
+    return project_root  # pragma: no cover
 
 
 class Formatter(Enum):
@@ -215,7 +214,7 @@ def __init__(  # noqa: PLR0912, PLR0913, PLR0917
         if known_third_party:
             self.isort_config_kwargs["known_third_party"] = known_third_party
 
-        if isort.__version__.startswith("4."):
+        if isort.__version__.startswith("4."):  # pragma: no cover
             self.isort_config = None
         else:
             self.isort_config = isort.Config(settings_path=self.settings_path, **self.isort_config_kwargs)