chore: block @types/node@26 for @dependabot and revert examples to @types/node@24

[zimeg]

Summary

This pull request caps @types/node for Bolt for JavaScript and rolls the bundled examples back to v24.

• Extends the @types/node Dependabot ignore rules to also block 26.x (framework stays on the v18 line; examples on v24).
• Reverts chore(deps-dev): bump @types/node from 24.13.2 to 26.0.0 in /examples/custom-receiver #2983 and chore(deps-dev): bump @types/node from 24.13.2 to 26.0.0 in /examples/getting-started-typescript #2986, which had bumped @types/node to v26 in examples/custom-receiver and examples/getting-started-typescript; both return to the v24 line.

The Node 26 CI matrix addition was split out into #2990 so it can land independently.

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

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Latest commit: 94cf64e

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.48%. Comparing base (9839a50) to head (94cf64e).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2989   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files          45       45           
  Lines        7900     7900           
  Branches      708      708           
=======================================
  Hits         7464     7464           
  Misses        428      428           
  Partials        8        8           

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[zimeg]

@mwbrooks For now I think this is alright to merge but I have hope in future updates 🎁

Also I'm thinking all examples should use the complete "^X.Y.Z" format with a package lock but this is outside scope of the PR here so I will merge now 🔏