Gradle 7.5 & Kotlin 1.6.10

[0xnm]

What does this PR do?

This change updates Gradle to version 7.5 and Kotlin to version 1.6.10.

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 #103 (77ae3fb) into develop (33f9db2) will increase coverage by 0.43%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop     #103      +/-   ##
=============================================
+ Coverage      87.31%   87.74%   +0.43%     
- Complexity       145      146       +1     
=============================================
  Files             20       20              
  Lines            465      465              
  Branches          53       53              
=============================================
+ Hits             406      408       +2     
+ Misses            40       38       -2     
  Partials          19       19              

Impacted Files	Coverage Δ
...in/kotlin/com/datadog/gradle/plugin/DatadogSite.kt	93.33% <0.00%> (+13.33%)	⬆️