Update googleAdkKotlin to v0.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.google.adk:google-adk-kotlin-processor	0.7.0 → 0.8.0
com.google.adk:google-adk-kotlin-webserver	0.7.0 → 0.8.0
com.google.adk:google-adk-kotlin-core	0.7.0 → 0.8.0

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Release Notes

google/adk-kotlin (com.google.adk:google-adk-kotlin-processor)

v0.8.0

Features

• add a BigQuery agent analytics plugin (485f1f8)
• add an on-device LiteRT-LM chat example to the Android examples app (39fd962)
• add first batch of Java-friendly builders to ADK Kotlin (f8308fc)
• add Java ports of the first wave of ADK Kotlin examples (e13b607)
• add Java-friendly interop layer to ADK Kotlin (d6e4fb7)
• add MCP tool demo example (c04d6d9)
• add streaming response support in the Firebase model backend (805a131)
• capture the place-answer text on Maps grounding chunks (a47dda0)
• carry the JSON Schema constraint fields on Schema (d0547f9)
• keep thought signature and tool call parts through streaming and history (17e7519)
• mcp: keep MCP tool schema constraints and surface tool output schemas (cbc9d0a)
• preserve nested null values when converting to the GenAI SDK (22e1d59)
• preserve null values in event custom metadata (b3cfe8f)
• preserve null values in tool arguments (d698275)
• preserve null values in tool FunctionResponse (9164ed7)
• processor: declare the response shape of @​Tool functions (6f1009a)

Bug Fixes

• a2a: put JSpecify on the compile classpath (72731ca)
• align ML Kit streaming responses with the other model backends (c597ded)
• carry model-callback actions onto the emitted event (35f04af)
• core: only resume tool confirmations for calls this agent emitted (00cbc52)
• emit a final streaming response when a turn ends without text (cb236b4)
• mcp: stop failing on null-typed MCP tool schemas and keep enum values (06e7926)
• mcp: stop toolFilter dropping the tools useMcpResources adds (07e7fb7)
• processor: stop generating an unchecked cast for data class parameters (80b2dd8)
• propagate the model response error code and custom metadata to events (be9ecec)
• release a cancelled LiteRT-LM conversation promptly instead of stalling (df91e30)
• stop the ML Kit model echoing role markers and earlier turns (f02a07c)
• update Kotlin ADK RemoteA2AAgent to handle all terminal and interrupted task states (e1d3474)

Performance Improvements

• Improved the InMemorySessionService performance (7e07177)

Documentation

• add runnable long-running tool examples (resumable and non-resumable) (21340d2)

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