fix: add @types/serve-static to dependencies

[wegry]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

This change should be covered by the lint-types npm script.

Motivation / Use-Case

Fix #4467 with Yarn PnP and Typescript.

Breaking Changes

Additional Info

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: wegry / name: Zach Wegrzyniak (3f0fe64)

[codecov]

Codecov Report

Merging #4468 (487a325) into master (07aaa45) will decrease coverage by 0.12%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4468      +/-   ##
==========================================
- Coverage   92.31%   92.19%   -0.13%     
==========================================
  Files          16       16              
  Lines        1601     1601              
  Branches      604      604              
==========================================
- Hits         1478     1476       -2     
- Misses        112      114       +2     
  Partials       11       11              

Impacted Files	Coverage Δ
lib/servers/WebsocketServer.js	89.74% <0.00%> (-5.13%)	⬇️

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[wegry]

I tweaked the commit message to try and match standard changelog.

[alexander-akait]

We should do patch release, pinned, will merge after CI