docs(changelog): add Python signatures PEP 8 compliance entry

Added a changelog entry for the PEP 8 compliance of Python function
signatures default values.

tests/unit/core/python/_core/test_PythonDocumentationGenerator/test_generate_documentation/case02/project/src/pkg/module.py

@@ -1,6 +1,5 @@
 def func(): ...
 
-
 def func2(a: int, b: int = 42, c=42, d=42):
     """
     :param c:

tests/unit/core/python/_core/test_project_dirs/pdir_2/src/pkg/module.py

@@ -2,14 +2,12 @@
 A test module.
 """
 
-
 def fn(a: int, b: int = 42, c=42, d=42):
     """
     :param c:
     :type c: int
     """
 
-
 def add(a: int | float, b: int | float) -> int | float:
     """
     Adds two numbers.

tests/unit/core/python/arguments/test_PythonASTArgumentsListParser.py

@@ -727,7 +727,9 @@ def argument_list(argument_list: str) -> ast.arguments:
             ],
         ),
         (
-            argument_list("a, b='a', /, *args, c=None, d=True, **kwargs"),
+            argument_list(
+                "a, b='a', /, *args, c=None, d=True, **kwargs"
+            ),
             [
                 PythonFunctionArgument(
                     'a',