chore: update v18 EOL banner

[aduh95]

Description

nodejs/node#58084

Validation

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Check List

• I have read the Contributing Guidelines and made commit messages that follow the guideline.
• I have run npm run format to ensure the code follows the style guide.
• I have run npm run test to check if all tests are passing.
• I have run npx turbo build to check if the website builds without errors.
• I've covered new added functionality with unit tests if necessary.

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[vercel]

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Name	Status	Preview	Updated (UTC)
nodejs-org	✅ Ready (Inspect)	Visit Preview	Apr 30, 2025 0:02am

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.81%. Comparing base (91a533f) to head (8b2b7cd).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7689      +/-   ##
==========================================
+ Coverage   74.80%   74.81%   +0.01%     
==========================================
  Files          98       98              
  Lines        7878     7878              
  Branches      199      199              
==========================================
+ Hits         5893     5894       +1     
+ Misses       1984     1983       -1     
  Partials        1        1              

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[github-actions]

Lighthouse Results

URL	Performance	Accessibility	Best Practices	SEO	Report
/en	🔴 68	🟢 100	🟢 100	🟢 91	🔗
/en/about	🟢 100	🟢 100	🟢 100	🟢 91	🔗
/en/about/previous-releases	🟢 99	🟢 100	🟢 100	🟠 83	🔗
/en/download	🟢 99	🟢 100	🟢 100	🟢 91	🔗
/en/blog	🟢 100	🟢 100	🟢 96	🟢 92	🔗

[ovflowd]

@nodejs/nodejs-website requesting fast tracking of this PR ✨