Update React Native to 0.81.5 in gradle dependency catalog

[wmathurin]

Summary

• Updates React Native version from 0.79.3 to 0.81.5 in gradle/libs.versions.toml
• Aligns with the version already specified in libs/SalesforceReact/package.json

Context

The package.json in libs/SalesforceReact already declares React Native 0.81.5, but the gradle dependency catalog was still pointing to 0.79.3. This caused a version mismatch between the npm dependencies and the gradle dependencies.

Test plan

• Verified build succeeds: ./gradlew :libs:SalesforceReact:build
• Build completed successfully in 52s with all tasks passing

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.17%. Comparing base (f2c1445) to head (b9411ff).

Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #2894   +/-   ##
=========================================
  Coverage     55.16%   55.17%           
- Complexity     2508     2509    +1     
=========================================
  Files           226      226           
  Lines         17781    17781           
  Branches       2328     2328           
=========================================
+ Hits           9809     9810    +1     
+ Misses         6967     6966    -1     
  Partials       1005     1005           

Components	Coverage Δ
Analytics	48.71% <ø> (ø)
SalesforceSDK	41.91% <ø> (+0.01%)	⬆️
Hybrid	59.30% <ø> (ø)
SmartStore	78.22% <ø> (ø)
MobileSync	82.12% <ø> (ø)
React	51.50% <ø> (ø)
see 1 file with indirect coverage changes

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[wmathurin]

RN is broken because of AGP/Gradle version incompatibilities. That will be sorted out in future PRs (by upgrading RN and also possibly lowering our AGP/Gradle version a bit).