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[ty] Integer indexing into bytes returns int (#18218)

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## Summary

Resolves [#461](https://github.com/astral-sh/ty/issues/461).

ty was hardcoded to infer `BytesLiteral` types for integer indexing into
`BytesLiteral`. It will now infer `IntLiteral` types instead.

## Test Plan

Markdown tests.
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16
crates/ty_python_semantic/resources/mdtest/subscript/bytes.md
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@ -5,16 +5,16 @@
```py
b = b"\x00abc\xff"
reveal_type(b[0]) # revealed: Literal[b"\x00"]
reveal_type(b[1]) # revealed: Literal[b"a"]
reveal_type(b[4]) # revealed: Literal[b"\xff"]
reveal_type(b[0]) # revealed: Literal[0]
reveal_type(b[1]) # revealed: Literal[97]
reveal_type(b[4]) # revealed: Literal[255]
reveal_type(b[-1]) # revealed: Literal[b"\xff"]
reveal_type(b[-2]) # revealed: Literal[b"c"]
reveal_type(b[-5]) # revealed: Literal[b"\x00"]
reveal_type(b[-1]) # revealed: Literal[255]
reveal_type(b[-2]) # revealed: Literal[99]
reveal_type(b[-5]) # revealed: Literal[0]
reveal_type(b[False]) # revealed: Literal[b"\x00"]
reveal_type(b[True]) # revealed: Literal[b"a"]
reveal_type(b[False]) # revealed: Literal[0]
reveal_type(b[True]) # revealed: Literal[97]
x = b[5] # error: [index-out-of-bounds] "Index 5 is out of bounds for bytes literal `Literal[b"\x00abc\xff"]` with length 5"
reveal_type(x) # revealed: Unknown