ast: Add missing APIs for Python 3.14 and 3.15 syntax (#15930)

ast: add missing APIs for new syntax

Author: AlexWaygood

stdlib/ast.pyi

@@ -956,14 +956,27 @@ class DictComp(expr):
     else:
         value: expr
     generators: list[comprehension]
-    if sys.version_info >= (3, 13):
+    if sys.version_info >= (3, 15):
+        def __init__(
+            self, key: expr, value: expr | None = None, generators: list[comprehension] = ..., **kwargs: Unpack[_Attributes]
+        ) -> None: ...
+    elif sys.version_info >= (3, 13):
         def __init__(
             self, key: expr, value: expr, generators: list[comprehension] = ..., **kwargs: Unpack[_Attributes]
         ) -> None: ...
     else:
         def __init__(self, key: expr, value: expr, generators: list[comprehension], **kwargs: Unpack[_Attributes]) -> None: ...
 
-    if sys.version_info >= (3, 14):
+    if sys.version_info >= (3, 15):
+        def __replace__(
+            self,
+            *,
+            key: expr = ...,
+            value: expr | None = ...,
+            generators: list[comprehension] = ...,
+            **kwargs: Unpack[_Attributes],
+        ) -> Self: ...
+    elif sys.version_info >= (3, 14):
         def __replace__(
             self, *, key: expr = ..., value: expr = ..., generators: list[comprehension] = ..., **kwargs: Unpack[_Attributes]
         ) -> Self: ...
@@ -2147,6 +2160,10 @@ class NodeVisitor:
         def visit_TypeVarTuple(self, node: TypeVarTuple) -> Any: ...
         def visit_TypeAlias(self, node: TypeAlias) -> Any: ...
 
+    if sys.version_info >= (3, 14):
+        def visit_TemplateStr(self, node: TemplateStr) -> Any: ...
+        def visit_Interpolation(self, node: Interpolation) -> Any: ...
+
     # visit methods for deprecated nodes
     def visit_ExtSlice(self, node: ExtSlice) -> Any: ...
     def visit_Index(self, node: Index) -> Any: ...