chore(deps): update specmatic.version to v2.55.3 - #177

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830, stCarolas/setup-maven@d6af6abeda15e98926a57b5aa970a96bb37f97d1. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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