Bump github.com/labstack/echo/v4 from 4.15.0 to 4.15.3 - #150

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, docker/build-push-action@v6.18.0, docker/metadata-action@v5.7.0, docker/setup-buildx-action@v3.10.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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