Fix related to the upgrade to mypy 1.15

Author: Pierre-Sassoulas

pylint/lint/message_state_handler.py

@@ -378,7 +378,7 @@ def process_tokens(self, tokens: list[tokenize.TokenInfo]) -> None:
                                 args=("disable-all", "skip-file"),
                             )
                         self.linter.add_message("file-ignored", line=start[0])
-                        self._ignore_file = True
+                        self._ignore_file: bool = True
                         return
                     try:
                         meth = self._options_methods[pragma_repr.action]

pylint/testutils/functional/lint_module_output_update.py

@@ -22,9 +22,7 @@ class TestDialect(csv.excel):
         delimiter = ":"
         lineterminator = "\n"
 
-    # TestDialect inherit from csv.excel, which inherit from Dialect
-    # probably something wrong in csv typing
-    csv.register_dialect("test", TestDialect)  # type: ignore[arg-type]
+    csv.register_dialect("test", TestDialect)
 
     def _check_output_text(
         self,