`--warn-return-any` not applied to generics

Bug Report

When a function annotated to return tuple[T] returns tuple[Any] no error is raised. Same with list.

To Reproduce

from __future__ import annotations
from typing import Any

def passes() -> tuple[str]:
    a: Any
    return (a,)

def fails_1() -> tuple[str]:
    a: int
    return (a,)
    # error: Incompatible return value type (got "Tuple[int]", expected "Tuple[str]")

def fails_2() -> str:
    a: Any
    return a
    # error: Returning Any from function declared to return "str"

Expected Behavior

I'd expect passes() to fail with error: Returning Tuple[Any] from function declared to return "Tuple[str]" when using mypy with --strict

Actual Behavior

Tuple[Any] is inferred to Tuple[str]

Your Environment

• Mypy version used: 0.812
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files):

# setup.cfg
[mypy]
python_version = 3.8
strict = true
warn_unreachable = true
implicit_reexport = true
ignore_missing_imports = true

• Python version used: 3.9.1
• Operating system and version: macOS 10.13.6

Start with the supplied Python reproducer containing tuple[str], tuple[Any], list, and Any returns, and run it with the reported strict configuration. Trace how generic return types are inferred and checked, then add coverage for the tuple case and confirm that the expected Returning Tuple[Any] diagnostic is produced.