Fix #1224 Jetty 9.x security upgrades + http4k, ktor upgrades

[seratch]

This pull request resolves #1224

Category (place an x in each of the [ ])

• bolt (Bolt for Java)
• bolt-{sub modules} (Bolt for Java - optional modules)
• slack-api-client (Slack API Clients)
• slack-api-model (Slack API Data Models)
• slack-api-*-kotlin-extension (Kotlin Extensions for Slack API Clients)
• slack-app-backend (The primitive layer of Bolt for Java)

Requirements

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[codecov]

Codecov Report

Merging #1225 (6a9fb5b) into main (629dca8) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1225      +/-   ##
============================================
- Coverage     74.85%   74.81%   -0.04%     
+ Complexity     4079     4075       -4     
============================================
  Files           437      437              
  Lines         12855    12855              
  Branches       1298     1298              
============================================
- Hits           9622     9618       -4     
- Misses         2475     2477       +2     
- Partials        758      760       +2     

see 4 files with indirect coverage changes

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