refactor!: use all ruff rules

src/project.py

@@ -1,29 +1,26 @@
-import os.path
+import pathlib
 import typing
 
 import toml
 
-__project_data = None
-
 
 def __get_project_data() -> None | dict[str, typing.Any]:
-    global __project_data
-    if __project_data is None:
-        pyproject_toml_file = os.path.join(
-            os.path.dirname(__file__), "..", "pyproject.toml"
-        )
-        if os.path.exists(pyproject_toml_file) and os.path.isfile(pyproject_toml_file):
-            try:
-                data = toml.load(pyproject_toml_file)
-                if "project" in data:
-                    __project_data = data["project"]
-            except TypeError, toml.TomlDecodeError, FileNotFoundError:
-                pass
-    return __project_data
+    pyproject_toml_file = pathlib.Path(__file__) / ".." / ".." / "pyproject.toml"
+    if pyproject_toml_file.is_file():
+        try:
+            data = toml.load(pyproject_toml_file)
+            if "project" in data:
+                return data["project"]
+        except TypeError, toml.TomlDecodeError, FileNotFoundError:
+            pass
+    return None
+
+
+__project_data = __get_project_data()
 
 
 def __get_str_value(key: str) -> str:
-    project_data = __get_project_data()
+    project_data = __project_data
     if project_data is not None and key in project_data:
         return project_data[key]
     return "unknown"