Relax decimal requirement

[aifrak]

Allow other projects to install this library with Decimal 3.0+.

This is related to the CVE-2026-32686.

Summary by Sourcery

Build:

• Update mix.exs dependency to allow installation with Decimal 3.0+ while retaining support for 2.x.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Relaxes the Decimal library version requirement to allow installing with either Decimal 2.1+ or 3.0+, improving compatibility and addressing a security advisory dependency constraint.

File-Level Changes

Change	Details	Files
Relaxed Decimal dependency version constraint to support both 2.x and 3.x series.	Updated the Decimal dependency requirement to allow versions ~> 2.1 or ~> 3.0. Kept all other Mix project dependencies and configuration unchanged.	mix.exs

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