[TO BE FIXED] Tests for node 18.js missing or engines clause outdated.

[mcm1957]

Tests for node.js 18 are missing at test-and.release-workflow as engines clause at package.json still specifies node>= 18.x

So either reass node.js 18.x tests to workflow OR adapter engines clause at package.json to require node.js 20 minimum. Note that raising node.js requirements requires at least a minor version bump as it is sort of breaking change.

[This issue must be fixed for next stable release]