[build] Use Node.js v20 engine as minimum version

[vrubezhny]

The reasons:

• The mainenance of Node.js v18 (LTS) ends 2025-04-30, so it's time to update the engine
• A lot of used dependencies declare Node.js v20 as minimum version, it doesn't make sence to continue using v18 as minimum Node.js engine version, f.i.:

npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'glob@11.0.1',
npm WARN EBADENGINE   required: { node: '20 || >=22' },
npm WARN EBADENGINE   current: { node: 'v18.17.1', npm: '9.6.7' }
npm WARN EBADENGINE }
...
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'path-scurry@2.0.0',
npm WARN EBADENGINE   required: { node: '20 || >=22' },
npm WARN EBADENGINE   current: { node: 'v18.17.1', npm: '9.6.7' }
npm WARN EBADENGINE }
...
npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: 'lru-cache@11.0.0',
npm WARN EBADENGINE   required: { node: '20 || >=22' },
npm WARN EBADENGINE   current: { node: 'v18.17.1', npm: '9.6.7' }
npm WARN EBADENGINE }

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.63%. Comparing base (da60441) to head (52cf79f).
Report is 961 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4958       +/-   ##
===========================================
+ Coverage   32.37%   44.63%   +12.25%     
===========================================
  Files          85       99       +14     
  Lines        6505     8129     +1624     
  Branches     1349     1727      +378     
===========================================
+ Hits         2106     3628     +1522     
- Misses       4399     4501      +102     

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