chore(version): Update package versions to 3.13.0-beta.81 [skip ci]

CHANGELOG.md

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 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+# [3.13.0-beta.81](https://github.com/OHIF/Viewers/compare/v3.13.0-beta.80...v3.13.0-beta.81) (2026-05-21)
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+### Features
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+* **tests:** Add tests for duplicating contour segments ([#6002](https://github.com/OHIF/Viewers/issues/6002)) ([2258c79](https://github.com/OHIF/Viewers/commit/2258c7957a18ed0f1a75d2bd5d379006797b2882))
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 # [3.13.0-beta.80](https://github.com/OHIF/Viewers/compare/v3.13.0-beta.79...v3.13.0-beta.80) (2026-05-20)
 
 **Note:** Version bump only for package ohif-monorepo-root