deps: update msgpack requirement from >=1.2.2 to >=1.2.3 - #129

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: dependabot/fetch-metadata@21025c705c08248db411dc16f3619e6b5f9ea21a. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/