[core] CI fails since Node.js 18.19.0

[lhilgert9]

Since #40080 CI fails when running the validate-declarations script. This is caused by ts-node. It is the same issue as mentioned here. The error was not noticed because the old version (18.8.2) was still used for the CI test when the version was upgraded. My idea would therefore be to keep Node.js in version 18.8.2 for the time being until ts-node has a solution ready. Alternatively, you could change the script "ts-node --esm scripts/validateTypescriptDeclarations.mts" to "node --loader ts-node/esm scripts/validateTypescriptDeclarations.mts". However, this uses an experimental feature, so I would tend to use the former.

Current PRs, where I find the issue:

• [lab][LoadingButton] LoadingButton now inherits props from ButtonGroup #39679
• Bump GitHub Actions (major) #40167
• Bump @next/eslint-plugin-next to ^14.0.4 #40166
• Bump @argos-ci/core to ^1.3.0 #40161
• Bump webpack-bundle-analyzer to ^4.10.1 #40160
• and much more

[mnajdova]

Thanks for the report and the investigation. I noticed the issue myself today too I would vote for reverting the commit for now too, but I would let @michaldudak check as he is mostly familiar with the infra.

[michaldudak]

I agree, let's revert the problematic PR for now. We'll discuss the long-term solution within the team. I'll prepare a fix.