🔥 Removed Node.js v18 support

[ErisDS]

ref #23924
closes https://linear.app/ghost/issue/PROD-1763/breaking-change-drop-support-for-node-18

• Node.js v18 was EOL on April 30, 2025
• This officially removes support for Node.js v18 in Ghost 6.0
• I've also removed some caveats from the dev tooling which applied to versions less than 18 and so is really not relevant anymore

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.25%. Comparing base (efe5bef) to head (357c4e3).
Report is 1 commits behind head on 6.x.

Additional details and impacted files

@@            Coverage Diff             @@
##              6.x   #23964      +/-   ##
==========================================
- Coverage   72.26%   72.25%   -0.01%     
==========================================
  Files        1533     1533              
  Lines      112638   112638              
  Branches    13725    13725              
==========================================
- Hits        81393    81391       -2     
+ Misses      30224    30208      -16     
- Partials     1021     1039      +18     

Flag	Coverage Δ
admin-tests	48.69% <ø> (-0.02%)	⬇️
e2e-tests	72.25% <ø> (-0.01%)	⬇️

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