Bump flake8 to 7.3.* (#14315)

Closes #14313

stubs/flake8/METADATA.toml

@@ -1,3 +1,3 @@
-version = "7.2.*"
+version = "7.3.*"
 upstream_repository = "https://github.com/pycqa/flake8"
 requires = ["types-pyflakes"]

stubs/flake8/flake8/_compat.pyi

@@ -3,3 +3,7 @@ from typing import Final
 FSTRING_START: Final[int]
 FSTRING_MIDDLE: Final[int]
 FSTRING_END: Final[int]
+
+TSTRING_START: Final[int]
+TSTRING_MIDDLE: Final[int]
+TSTRING_END: Final[int]

stubs/flake8/flake8/processor.pyi

@@ -43,6 +43,7 @@ class FileProcessor:
     def __init__(self, filename: str, options: Namespace, lines: list[str] | None = None) -> None: ...
     @property
     def file_tokens(self) -> list[TokenInfo]: ...
+    def tstring_start(self, lineno: int) -> None: ...
     def fstring_start(self, lineno: int) -> None: ...
     def multiline_string(self, token: TokenInfo) -> Generator[str, None, None]: ...
     def reset_blank_before(self) -> None: ...