build: install @types/express@^v5 as a dev dependency for express@^5

[zimeg]

Summary

This PR bumps @types/express to v5 to match the included express v5 package. These typings are also moved into the devDependencies since these are required for just the build step AFAIK! Fixes #2354.

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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.59%. Comparing base (606b243) to head (b8d66fc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2355   +/-   ##
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  Coverage   92.59%   92.59%           
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  Files          36       36           
  Lines        7472     7472           
  Branches      653      653           
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  Hits         6919     6919           
  Misses        545      545           
  Partials        8        8           

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[zimeg]

It's curious that @dependabot didn't catch this in the last round of updates... We seem to include just a handful of dependencies in this list, but I'm wondering if we want to revisit this?

https://github.com/slackapi/bolt-js/blob/main/.github/dependabot.yml

[seratch]

Good catch; LGTM

[seratch]

@zimeg Yeah, we can add more dependencies to the list. At least, having @types/* should be fine

[zimeg]

@seratch Thanks! And adding some dependencies sounds good. 🚀

It makes sense that express is kept at a minimum 5.0.0 IMO to avoid requiring updates across all dependencies of an app, but that might be interesting to revisit for keeping up with bug fixes and added features of bolt dependencies.

A combination of options for allow in this file seem promising for updating a select few more dependencies also: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#allow

Hoping to explore this more after thinking about versions a bit, but I'd love to know if you have immediate thoughts on these numbers 🙏