chore(deps): update dependency aqua:grafana/gcx to v1.2.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
aqua:grafana/gcx	tools	minor	1.1.1 → 1.2.0

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Release Notes

grafana/gcx (aqua:grafana/gcx)

v1.2.0

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Breaking changes

• A locked OS keychain is now its own fatal failure class (Keychain locked). gcx stops credential-consuming commands instead of falling back to a plaintext write, and the error explains how to unlock the keychain for the session (#​1142)
• Remove the broken gcx assistant dashboard subcommand (#​1230)

New features

• Add the Database Observability provider: gcx dbo11y instances list and gcx dbo11y instances get <name> (#​1199)

Fixes

• Remove the duplicated --agent-id default from assistant help text (#​1232)

Other

• Add keychain setup and troubleshooting reference docs (#​1142)
• Teach the add-datasource skill the shared raw-SQL contract (#​1227)
• Bump create-github-app-token to 0.3.1 and tune the CI review process (#​1236, #​1217)

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