RUMM-2094: Gradle 7.5

[0xnm]

What does this PR do?

Bumps Gradle to version 7.5. No more warnings about Kotlin version mismatch in the build classpath (because kotlin-embedded is also 1.6 now) and about Java mismatch 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 #997 (3cb005c) into feature/sdkv2 (5084d1e) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##           feature/sdkv2     #997      +/-   ##
=================================================
- Coverage          82.95%   82.90%   -0.05%     
=================================================
  Files                296      296              
  Lines               9841     9841              
  Branches            1603     1603              
=================================================
- Hits                8163     8158       -5     
- Misses              1193     1197       +4     
- Partials             485      486       +1     

Impacted Files	Coverage Δ
...g/internal/domain/event/DdSpanToSpanEventMapper.kt	95.92% <0.00%> (-4.08%)	⬇️
...rsistence/file/batch/PlainBatchFileReaderWriter.kt	88.24% <0.00%> (-2.94%)	⬇️
...droid/rum/tracking/ActivityViewTrackingStrategy.kt	86.54% <0.00%> (-1.92%)	⬇️
...al/persistence/file/batch/BatchFileOrchestrator.kt	92.59% <0.00%> (-1.85%)	⬇️
...android/v2/core/internal/DatadogContextProvider.kt	81.03% <0.00%> (ø)
...android/rum/internal/ndk/DatadogNdkCrashHandler.kt	88.30% <0.00%> (+1.60%)	⬆️