Gradle 7.6 & AGP 7.4.0

[0xnm]

What does this PR do?

This change bumps Gradle version used to 7.6, and AGP version to 7.4.0.

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 #1232 (33f9e07) into feature/sdkv2 (7b37814) will increase coverage by 0.10%.
The diff coverage is n/a.

@@                Coverage Diff                @@
##           feature/sdkv2    #1232      +/-   ##
=================================================
+ Coverage          82.75%   82.84%   +0.10%     
=================================================
  Files                358      358              
  Lines              12623    12623              
  Branches            2098     2098              
=================================================
+ Hits               10445    10457      +12     
+ Misses              1528     1526       -2     
+ Partials             650      640      -10     

Impacted Files	Coverage Δ
...g/internal/domain/event/DdSpanToSpanEventMapper.kt	95.83% <0.00%> (-4.17%)	⬇️
...src/main/kotlin/com/datadog/android/DatadogSite.kt	83.33% <0.00%> (-3.33%)	⬇️
...ain/java/com/datadog/opentracing/PendingTrace.java	58.62% <0.00%> (-0.86%)	⬇️
...lin/com/datadog/android/rum/internal/RumFeature.kt	92.03% <0.00%> (ø)
...android/log/internal/logger/TelemetryLogHandler.kt	85.71% <0.00%> (ø)
.../android/rum/internal/domain/scope/RumViewScope.kt	95.54% <0.00%> (+0.18%)	⬆️
.../android/rum/internal/monitor/DatadogRumMonitor.kt	91.35% <0.00%> (+1.08%)	⬆️
...id/rum/internal/ndk/DatadogNdkCrashEventHandler.kt	92.00% <0.00%> (+3.00%)	⬆️
...ndroid/telemetry/internal/TelemetryEventHandler.kt	73.44% <0.00%> (+3.12%)	⬆️
...in/com/datadog/android/log/internal/LogsFeature.kt	88.46% <0.00%> (+3.85%)	⬆️
... and 1 more