Fix tests and CI

[Simply007]

Motivation

• Fixes CI to use latest Node.js for some steps
• Fixes tests (E2E), after changes in the sample project

Checklist

• [ ] Code follows coding conventions held in this repo
• [ ] Automated tests have been added
• [ ] Tests are passing
• [ ] Docs have been updated (if applicable)
• [ ] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[Simply007]

Blocked by DEL-4591

[codecov[bot]]

Codecov Report

Merging #118 (14ef6e9) into master (20863ee) will increase coverage by 0.05%. Report is 7 commits behind head on master. The diff coverage is n/a.

:exclamation: Current head 14ef6e9 differs from pull request most recent head 8342ff4. Consider uploading reports for the commit 8342ff4 to get more accurate results

@@             Coverage Diff              @@
##             master     #118      +/-   ##
============================================
+ Coverage     98.10%   98.16%   +0.05%     
- Complexity      195      199       +4     
============================================
  Files            22       22              
  Lines           581      600      +19     
============================================
+ Hits            570      589      +19     
  Misses           11       11              

Files Changed	Coverage Δ
src/Kontent/Ai/Delivery/DeliveryClient.php	94.35% <ø> (ø)

... and 7 files with indirect coverage changes

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