chore(release): use native Elixir versioning

[yordis]

• Keep the package version in its native metadata so release automation and builds share one source of truth.
• Avoid carrying a repository-specific version file that other language clients do not require.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between e4f0d93 and 76bb5f4.

📒 Files selected for processing (3)

• .github/release-please-config.json
• .version
• mix.exs

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