chore: refresh build toolchain and bump appcompat

[devin-ai-integration]

Summary

No LaunchDarkly SDK change needed — launchdarkly-android-client-sdk is already pinned to 5.13.2, the latest 5.x on Maven Central, and no deprecated SDK APIs are used (verified by compiling with -Xlint:deprecation: zero warnings). This PR only refreshes the build tooling and one stale AndroidX pin.

• androidx.appcompat:appcompat 1.2.0 → 1.7.1 (latest 1.x; the existing pin was from 2020). Requires compileSdk ≥ 34, which this project already targets.
• Android Gradle Plugin 8.7.0 → 8.13.2 and Gradle wrapper 8.9 → 8.14.3 (regenerated with ./gradlew wrapper --gradle-version 8.14.3, hence the gradlew/gradlew.bat/gradle-wrapper.jar churn). Both stay within their current major.
• Groovy DSL space assignment → = in app/build.gradle, which Gradle 9 warns "will fail with an error in Gradle 10". Matches the same change already merged in the Kotlin sibling repo (chore: replace deprecated Resources.getColor and Gradle space-assignment DSL hello-android#46):

  - namespace "com.launchdarkly.hello_android"
  - compileSdk 34
  + namespace = "com.launchdarkly.hello_android"
  + compileSdk = 34

  (also applicationId, versionCode, versionName, minifyEnabled, source/targetCompatibility)

How verified

• ./gradlew clean assembleDebug --warning-mode all — BUILD SUCCESSFUL, no deprecation warnings.
• Installed the debug APK on an Android 34 x86_64 emulator with the hello-apps mobile key injected locally (never committed) and launched it. The SDK initialized and the flag evaluation rendered (the default my-boolean-flag key is not defined in that project, so it falls back to false):

Link to Devin session: https://app.devin.ai/sessions/bb345040611843e79e555dc72dfd5c54
Requested by: @jsonbailey

---

Note

Low Risk
Build and dependency version bumps only; no auth, data, or application runtime logic changes.

Overview
Refreshes the Android build stack without changing LaunchDarkly SDK usage or app logic.

Toolchain: Android Gradle Plugin 8.7.0 → 8.13.2, Gradle wrapper 8.9 → 8.14.3 (with updated gradlew / gradlew.bat and wrapper properties such as networkTimeout and validateDistributionUrl).

Dependencies: androidx.appcompat:appcompat 1.2.0 → 1.7.1 in app/build.gradle.

Gradle DSL: Space-style assignments in app/build.gradle are switched to = (namespace, compileSdk, applicationId, versions, minifyEnabled, Java compatibility) to align with Gradle 9+ expectations.

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[devin-ai-integration]

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