Update dependency elixir to v1.15.7

[renovate]

This PR contains the following updates:

Package	Update	Change
elixir (source)	patch	1.15.6 -> 1.15.7

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Release Notes

elixir-lang/elixir (elixir)

v1.15.7

Compare Source

1. Enhancements

Elixir

• [Elixir] Allow code evaluation across Elixir versions

2. Bug fixes

EEx

• [EEx] Do not emit duplicate warnings from tokenizer

Mix

• [mix format] Correctly match file to subdirectory in Mix.Tasks.Format.formatter_for_file/2

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