fix(ci): bump Kotlin Gradle plugin to 2.3.0

[SelaseKay]

Description

firebase-auth 24.2.0 (Firebase Android BoM 34.18.0) was compiled with Kotlin 2.3.0 metadata. Example apps and the aggregate tests project still pin the Kotlin Gradle plugin to 1.9.x / 2.1.x / 2.2.x, so Android e2e builds fail when compiling :firebase_auth:compileDebugKotlin:

Module was compiled with an incompatible version of Kotlin.
The binary version of its metadata is 2.3.0, expected version is 2.1.0.

Bump the Kotlin Gradle plugin to 2.3.0 across example apps, the Firestore pipeline example, tests/android, and the remaining plugin ext.kotlin_version pins. The firebase_auth example already uses 2.3.0.

Related Issues

• Related to feat: bump Firebase Android SDK to 34.18.0 #18597

Checklist

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Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change.
• No, this is not a breaking change.

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[wiz-9635d3485b]

Wiz Scan Summary

Scanner	Findings
Vulnerabilities	2
Sensitive Data	-
Secrets	-
IaC Misconfigurations	-
SAST Findings	-
Software Management Findings	-
Total	2

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