Upgrade AGP to 8.4.0, Android Build Tools to 31.4.0, and Gradle to 8.7.

[lihenggui]

What I have done and why That's the minimum change for upgrading AGP to 8.4.0 Fixes #1433

Package	From	To
com.android.tools.lint:lint-api	31.3.0	31.4.0
com.android.tools.lint:lint-checks	31.3.0	31.4.0
com.android.tools.lint:lint-tests	31.3.0	31.4.0
com.android.tools:common	31.3.0	31.4.0
com.android.tools.build:gradle	8.3.0	8.4.0
com.android.application	8.3.0	8.4.0
com.android.library	8.3.0	8.4.0
com.android.test	8.3.0	8.4.0
androidx.benchmark:benchmark-macro-junit4	1.2.3	1.2.4
androidx.baselineprofile	1.2.3	1.2.4
Gradle	8.5	8.7

Updates com.android.tools.lint:lint-api from 31.3.0 to 31.4.0

Updates com.android.tools.lint:lint-checks from 31.3.0 to 31.4.0

Updates com.android.tools.lint:lint-tests from 31.3.0 to 31.4.0

Updates com.android.tools:common from 31.3.0 to 31.4.0

Updates com.android.tools.lint:lint-checks from 31.3.0 to 31.4.0

Updates com.android.tools.lint:lint-tests from 31.3.0 to 31.4.0

Updates com.android.tools.build:gradle from 8.3.0 to 8.4.0

Updates com.android.application from 8.3.0 to 8.4.0

Updates com.android.library from 8.3.0 to 8.4.0

Updates com.android.test from 8.3.0 to 8.4.0

Updates com.android.tools:common from 31.3.0 to 31.4.0

Updates com.android.application from 8.3.0 to 8.4.0

Updates com.android.library from 8.3.0 to 8.4.0

Updates com.android.test from 8.3.0 to 8.4.0

Updates androidx.benchmark:benchmark-macro-junit4 from 1.2.3 to 1.2.4

Updates androidx.baselineprofile from 1.2.3 to 1.2.4

Updates Gradle from 8.5 to 8.7

How I'm testing it

Choose at least one:

• ✔️ Unit tests
• ✔️ UI tests
• ✔️ Screenshot tests

Do tests pass?

• [✔️] Run local tests on DemoDebug variant: ./gradlew testDemoDebug
• [✔️] Check formatting: ./gradlew --init-script gradle/init.gradle.kts spotlessApply

Is this your first pull request? No

[dturner]

Thanks very much for the PR, including a well written description @lihenggui, and thanks for the review @alexvanyo.