fix: update @types/express-serve-static-core to 5.1.1 and fix typing of Request params

[kriswest]

While testing I noticed that theres an update to express-serve-static-core 5.06 -> 5.1.1 that contains a correction to express's Request type - which looks breaking (but the change actually happened in a major release, the type was just wrong).

At present Request.params has type Record<string, string> but its being 'corrected' to Record<string, string | string []> (as path params in express 5 can have multiple components and provide an array of values in those cases).

To prevent type issues that break the build, we need to strongly type Request, which I've done in this PR. @jescalada this may have a bearing on #1323 where you are adding in the Request type in may places (and may also need to add the types for the params object there if accessing its properties).

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

[codecov]

Codecov Report

❌ Patch coverage is 65.95745% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.39%. Comparing base (468bd12) to head (1b03ca3).

Files with missing lines	Patch %	Lines
src/service/routes/repo.ts	61.90%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1409      +/-   ##
==========================================
+ Coverage   81.37%   81.39%   +0.02%     
==========================================
  Files          67       67              
  Lines        4735     4741       +6     
  Branches      819      819              
==========================================
+ Hits         3853     3859       +6     
  Misses        867      867              
  Partials       15       15              

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