Upgrade gson to the latest version

[seratch]

This pull request upgrades gson library version to the latest one. This minor version upgrade does not bring any internal changes to our enhancement, but this affect user side dependencies, so we can release as a new minor version.

Additionaly, I've confirmed micronaut minor upgrade does not require any changes, so I've included the bump too. However, http4k and ktor major upgrades seem to require code changes. Thus, I didn't touch them this time.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 73.09%. Comparing base (236b8e9) to head (c62466d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1437      +/-   ##
============================================
+ Coverage     73.07%   73.09%   +0.02%     
- Complexity     4381     4383       +2     
============================================
  Files           475      475              
  Lines         14243    14243              
  Branches       1447     1447              
============================================
+ Hits          10408    10411       +3     
+ Misses         2977     2975       -2     
+ Partials        858      857       -1     

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[WilliamBergamin]

Thank you 🙏