ci: remove npm 8.5.3

[koonpeng]

What's new

The npm script bug has been fixed so we can remove the alternative matrix now.
Fixes #559.

Self-checks

• I have prototyped this new feature (if necessary) on Figma
• I'm familiar with and follow this Typescript guideline
• I added unit-tests for new components
• I tried testing edge cases
• I tested the behavior of the components that interact with the backend, with an e2e test

Discussion

[codecov]

Codecov Report

Merging #611 (03902ad) into main (987fdf3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #611   +/-   ##
=======================================
  Coverage   75.87%   75.87%           
=======================================
  Files         312      312           
  Lines        6026     6026           
  Branches      642      650    +8     
=======================================
  Hits         4572     4572           
+ Misses       1264     1262    -2     
- Partials      190      192    +2     

Flag	Coverage Δ
api-server	81.41% <ø> (ø)
dashboard	62.30% <ø> (ø)
reporting-server	77.88% <ø> (ø)
rmf-auth	∅ <ø> (∅)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/dashboard/src/utils.ts	0.00% <0.00%> (ø)

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[aaronchongth]

Thanks for monitoring the fix!