[`flake8-simplify`] Apply `SIM113` when index variable is of type `int` (#21395)
## Summary
Fixes #21393
Now the rule checks if the index variable is initialized as an `int`
type rather than only flagging if the index variable is initialized to
`0`. I used `ResolvedPythonType` to check if the index variable is an
`int` type.
## Test Plan
Updated snapshot test for `SIM113`.
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Co-authored-by: Brent Westbrook <36778786+ntBre@users.noreply.github.com>