RUMM-3058: Update Gradle to version 8.0, update Kotlin, AGP, OkHttp versions as well.

[0xnm]

What does this PR do?

Gradle 8.0 is released, so to make sure that our Gradle Plugin is compatible with this major release, this PR bumps Gradle version used to 8.0 as well.

Also Kotlin is update to version 1.8.10 (this is the version of Kotlin DSL used by Gradle 8.0, so safe to go), and also OkHttp and AGP versions are bumped as well.

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• [ ] Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

Merging #148 (69109c3) into develop (ea9984c) will increase coverage by 0.47%. The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop     #148      +/-   ##
=============================================
+ Coverage      86.40%   86.87%   +0.47%     
- Complexity       177      178       +1     
=============================================
  Files             21       21              
  Lines            581      579       -2     
  Branches          75       73       -2     
=============================================
+ Hits             502      503       +1     
+ Misses            49       48       -1     
+ Partials          30       28       -2     

Impacted Files	Coverage Δ
...com/datadog/gradle/plugin/DdAndroidGradlePlugin.kt	74.36% <0.00%> (+0.22%)	:arrow_up:
...m/datadog/gradle/plugin/DdMappingFileUploadTask.kt	88.57% <0.00%> (+0.63%)	:arrow_up:
...in/com/datadog/gradle/plugin/DdCheckSdkDepsTask.kt	88.89% <0.00%> (+3.78%)	:arrow_up: