[flake8-simplify] Make example error out-of-the-box (SIM113)

[MeGaGiGaGon]

Summary

Part of #18972

This PR makes enumerate-for-loop (SIM113)'s example error out-of-the-box

Old example

fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(f"{i + 1}. {fruit}")
    i += 1

New example

fruits = ["apple", "banana", "cherry"]
i = 0
for fruit in fruits:
    print(f"{i + 1}. {fruit}")
    i += 1

Test Plan

N/A, no functionality/tests affected

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.