build: use node:18.20-alpine3.19 in Docker build

[aloisklink]

📑 Summary

Chromium 128.0.6613.84-r0 (used in Alpine 3.20) seems to be having issues with puppeteer/mermaid-cli, so we can't use it yet.

Resolves failing CI in recent PRs (see https://github.com/mermaid-js/mermaid-cli/actions/workflows/compile-mermaid.yml), e.g.:

$ bash run-tests.sh test-positive mermaid-js/mermaid-cli/mermaid-cli:10.9.2-PullRequest0733.12
Generating single mermaid chart

ProtocolError: Page.enable timed out. Increase the 'protocolTimeout' setting in launch/connect calls for a higher timeout if needed.
    at new Callback (file:///home/mermaidcli/node_modules/puppeteer-core/lib/esm/puppeteer/common/Connection.js:58:35)
    at CallbackRegistry.create (file:///home/mermaidcli/node_modules/puppeteer-core/lib/esm/puppeteer/common/Connection.js:103:26)
    at Connection._rawSend (file:///home/mermaidcli/node_modules/puppeteer-core/lib/esm/puppeteer/common/Connection.js:212:26)
    at CDPSessionImpl.send (file:///home/mermaidcli/node_modules/puppeteer-core/lib/esm/puppeteer/common/Connection.js:419:78)
    at FrameManager.initialize (file:///home/mermaidcli/node_modules/puppeteer-core/lib/esm/puppeteer/common/FrameManager.js:133:24)
    at CDPPage._CDPPage_initialize (file:///home/mermaidcli/node_modules/puppeteer-core/lib/esm/puppeteer/common/Page.js:834:70)
    at CDPPage._create (file:///home/mermaidcli/node_modules/puppeteer-core/lib/esm/puppeteer/common/Page.js:57:90)
    at file:///home/mermaidcli/node_modules/puppeteer-core/lib/esm/puppeteer/common/Target.js:125:32
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async Target.page (file:///home/mermaidcli/node_modules/puppeteer-core/lib/esm/puppeteer/common/Target.js:128:23)

📏 Design Decisions

I've picked Node.JS v18.20, since it's a recent version of Node.JS v18.

We can use @dependabot to automatically update this later.

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added unit/e2e tests (if appropriate)
• 🔖 targeted master branch