Chore(ci): Test builds also on Node.js v20

[literat]

Description

Test builds also on Node.js v20.

Additional context

Issue reference

https://jira.lmc.cz/browse/DS-809

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• Follow the PR Title/Commit Message Convention.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

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[github-actions]

coverage: 71.623% (-8.7%) from 80.368%
when pulling 95b878f on chore/build-on-node-v20
into 654a147 on main.

[adamkudrna]

Without any doubts, this is the right direction. But please let's get rid of v16 as soon as possible so the build doesn't take more time than we really need. 🚀

[literat]

Without any doubts, this is the right direction. But please let's get rid of v16 as soon as possible so the build doesn't take more time than we really need. 🚀

That moment is near. We should make this change right after we release v2, e.g. release v3 right after that.