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

[renovate]

This PR contains the following updates:

Package	Update	Change
grafana/gcx	minor	1.1.0 → 1.2.0

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Release Notes

grafana/gcx (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)

v1.1.1

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Datasources

• Add support for the MySQL and Postgres datasources (#​970, #​969)
• Add support for the Elasticsearch datasource (#​971)
• Add support for Azure Monitor and Google Cloud Monitoring (#​965, #​974)
• Restructure the generic query router to keep it simple (#​1141)
• Add the experimental gcx traces diff command (#​1165)

Providers

• Add notification commands to the knowledge graph provider (#​1077)
• Add gcx irm incidents get-pir for post-incident reviews (#​1163)
• Report otlpIngestEndpointURL from frontend applications (#​1223)

Login and configuration

• Add --oauth-manual for hosts without a reachable callback (#​1136)
• Let environment credentials override a keychain failure (#​1066)
• Scope gcx config check to one explicit context (#​1155)

Fixes

• Include otlp_url and otlp_username in the cluster configuration (#​1198)
• Correct the order of dashboards in the output (#​1201)

Performance

• Build the discovery registry one time (#​925)
• Limit the parallel fan-out in resource commands (#​925)

Other

• Detect the pi coding agent harness for agent mode (#​1208)
• Report the batch resource volume as size buckets (#​1108)
• Add a Grafana version support policy to the documentation (#​1197)
• Regenerate the command line interface reference (#​1224)

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