refactor(android): Remove targetSdk from gradle config

[ahqsoftwares]

This PR aims to fix the following warning

w: file:///C:/Users/Windows/.cargo/registry/src/index.crates.io-6f17d22bba15001f/tauri-2.0.0-rc.2/mobile/android/build.gradle.kts:12:9: 'targetSdk: Int?' is deprecated. Will be removed from library DSL in v9.0. Use testOptions.targetSdk or/and lint.targetSdk instead

It removes targetSdk from the gradle kts files as it is deprecated and will be removed in DSL v9.0

[socket-security]

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👍 No dependency changes detected in pull request

[github-actions]

Package Changes Through 9620b87

There are 5 changes which include tauri-build with prepatch, tauri-cli with prerelease, @tauri-apps/cli with prerelease, tauri with prerelease, tauri-utils with prerelease

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
tauri-utils	2.0.0-rc.2	2.0.0-rc.3
tauri-bundler	2.0.1-rc.1	2.0.1-rc.2
tauri-runtime	2.0.0-rc.2	2.0.0-rc.3
tauri-runtime-wry	2.0.0-rc.2	2.0.0-rc.3
tauri-codegen	2.0.0-rc.2	2.0.0-rc.3
tauri-macros	2.0.0-rc.2	2.0.0-rc.3
tauri-plugin	2.0.0-rc.2	2.0.0-rc.3
tauri-build	2.0.0-rc.2	2.0.1-rc.0
tauri	2.0.0-rc.2	2.0.0-rc.3
@tauri-apps/cli	2.0.0-rc.3	2.0.0-rc.4
tauri-cli	2.0.0-rc.3	2.0.0-rc.4

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[lucasfernog]

we also need to make this change on the plugins workspace