chore(release/v0.3.0): release google-adk-community 0.3.0

[github-actions]

🤖 I have created a release beep boop

0.3.0 (2026-02-07)

Features

• Add Redis-backed session service to ADK community extensions (8c69144)
• Add Redis-backed session service to ADK community extensions (9804815)

Bug Fixes

• add workflow_dispatch trigger to release-please workflow (#52) (974ff14)
• set release-as at runtime instead of committing to config (#54) (b31ff43)
• update dependencies (d4a2614)
• update dependencies (0478acc)
• update dependencies and unit test workflow (6246db4)

Documentation

• Set the initial version (9aaf33e)
• Update version for 0.1.0 release (676d00f)
• Update version for 0.1.0 release (5130d5a)

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