deps: use node20 and npm 11

[v1v]

npm 11 stopped support for node18

See https://github.com/npm/cli/releases/tag/v11.0.0

npm now supports node ^20.17.0 || >=22.9.0

Therefore, the CI stopped working. See https://github.com/elastic/opbeans-frontend/actions/runs/12727194854/job/35476446434?pr=221

> [3/7] RUN npm install npm@latest -g:
0.783 npm error code EBADENGINE
0.783 npm error engine Unsupported engine
0.783 npm error engine Not compatible with your version of node/npm: [email protected]
0.783 npm error notsup Not compatible with your version of node/npm: [email protected]
0.783 npm error notsup Required: {"node":"^20.17.0 || >=22.9.0"}
0.783 npm error notsup Actual:   {"npm":"10.8.2","node":"v18.20.5"}
0.7[86](https://github.com/elastic/opbeans-frontend/actions/runs/12727194854/job/35476446434?pr=221#step:3:87) npm error A complete log of this run can be found in: /root/.npm/_logs/2025-01-11T20_03_25_637Z-debug-0.log
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Dockerfile:11