Fix parse_error input spec

[evadne]

elixir_errors:parse_error/5 receives the original parser input as a 4-tuple that includes indentation. Both parser call sites pass {String, StartLine, StartColumn, Indentation}, and cut_snippet/3 already pattern matches that shape.

This updates the spec to match the existing runtime contract.

Verification

• git diff --check
• make compile

[evadne]

There is an unrelated failure in https://github.com/elixir-lang/elixir/actions/runs/25930787536/job/76225550506 which I am investigating separately. It seems to be a non-deterministic formatting issue with refs based on their internal values.

EDIT: This is related to #13954 where the diff strings in ExUnit.DiffTest were changed from being rendered in infinity-length lines to 80-column lines. This interacts with PIDs or Refs that have variable-length internal values and may sometimes fit on one line when the line length is not infinity. For example when 2 PIDs are both quite short (with low numerical values that require fewer digits) they end up on the same line where the expectation in the relevant tests was that they should be on 2 lines, or vice versa.

EDIT: #15396 is opened to address the intermittent error in the last workflow.