Introduce API level 26 requirements for systemZoneOffset and buildLocalDateTime

[teogor]

Introduce API level 26 requirements for systemZoneOffset and buildLocalDateTime

This pull request updates the BuildProfile object to require API level 26 (Android 8.0 Oreo) for accessing systemZoneOffset and buildLocalDateTime. These methods rely on features introduced in API level 26, and adding these requirements ensures proper functionality and compatibility across devices.

Changes:

• Added @RequiresApi(Build.VERSION_CODES.O) annotations to both methods.
• Updated documentation to reflect the API level requirements.

Benefits:

• Improves compatibility with older devices by gracefully handling cases where the methods are not available.
• Maintains code clarity by explicitly indicating the required API level.
• Ensures that the plugin functions as expected on all supported devices.