Add default values for third-party stubs beginning with 'P' (#9957)

stubs/python-slugify/slugify/slugify.pyi

@@ -1,20 +1,20 @@
 from collections.abc import Iterable
 
 def smart_truncate(
-    string: str, max_length: int = ..., word_boundary: bool = ..., separator: str = ..., save_order: bool = ...
+    string: str, max_length: int = 0, word_boundary: bool = False, separator: str = " ", save_order: bool = False
 ) -> str: ...
 def slugify(
     text: str,
-    entities: bool = ...,
-    decimal: bool = ...,
-    hexadecimal: bool = ...,
-    max_length: int = ...,
-    word_boundary: bool = ...,
-    separator: str = ...,
-    save_order: bool = ...,
-    stopwords: Iterable[str] = ...,
-    regex_pattern: str | None = ...,
-    lowercase: bool = ...,
-    replacements: Iterable[Iterable[str]] = ...,
-    allow_unicode: bool = ...,
+    entities: bool = True,
+    decimal: bool = True,
+    hexadecimal: bool = True,
+    max_length: int = 0,
+    word_boundary: bool = False,
+    separator: str = "-",
+    save_order: bool = False,
+    stopwords: Iterable[str] = (),
+    regex_pattern: str | None = None,
+    lowercase: bool = True,
+    replacements: Iterable[Iterable[str]] = (),
+    allow_unicode: bool = False,
 ) -> str: ...