fix(build): update nx to 9.4.0

[xbaun]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/datorama/akita/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the new behavior?

Update nx to 9.4.0 to fix nodejs/node#32852 when building akita with node v12/v13.

Does this PR introduce a breaking change?

• Yes
• No

[NetanelBasal]

https://github.com/datorama/akita/runs/771327457?check_suite_focus=true

[xbaun]

Probably the problem is that node_modules is cached: https://github.com/datorama/akita/runs/771322765?check_suite_focus=true#step:4:8

[NetanelBasal]

But it should invalidate it when yarn.lock changes.

[xbaun]

It's just a guess by me, because the build action ran on my branch without any errors and nx is using the node_modules/.cache folder for caching build targets. In the action log it looks like the cache is not invalidated.

[NetanelBasal]

Let's remove the cache and see if it works.

[NetanelBasal]

Released.