[packages] fix another gradle 8 warnings (#22609)

# Why

there are other gradle 8 build warnings:

```
> Task :expo:processReleaseManifest
package="expo.core" found in source AndroidManifest.x

[packages] fix another gradle 8 warnings (#22609)

# Why

there are other gradle 8 build warnings:

```
> Task :expo:processReleaseManifest
package="expo.core" found in source AndroidManifest.xml: /home/runner/work/expo/expo/packages/expo/android/src/main/AndroidManifest.xml.
Setting the namespace via a source AndroidManifest.xml's package attribute is deprecated.
Please instead set the namespace (or testNamespace) in the module's build.gradle file, as described here: https://developer.android.com/studio/build/configure-app-module#set-namespace
This migration can be done automatically using the AGP Upgrade Assistant, please refer to https://developer.android.com/studio/build/agp-upgrade-assistant for more information.
```

# How

migrate `package` in **AndroidManifest.xml** to `namespace` in **build.gradle**

# Test Plan

ci passed

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