deps(compose): Update docker.io/n8nio/n8n Docker tag to v2.38.7

[renovate]

This PR contains the following updates:

Package	Update	Change	Pending
docker.io/n8nio/n8n (source)	patch	2.38.3 → 2.38.7	2.39.4 (+4)

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Release Notes

n8n-io/n8n (docker.io/n8nio/n8n)

v2.38.7

Bug Fixes

• core: Execute MCP toolkit members on workers (#​38277) (1025dc7)
• core: Reuse an existing consent grant after the visitor authenticates mid-flow (#​38249) (52c8a72)
• core: Trust the CA from GIT_SSL_CAINFO for source control HTTPS remotes (#​38297) (3234078)

v2.38.6

Performance Improvements

• core: Bound peak memory during source control push (#​37975) (b3c32da)

v2.38.5

Bug Fixes

• core: Keep reporting the original job error when the job key is gone (#​38028) (cfc385f)

v2.38.4

Bug Fixes

• core: Cap task runner task timeouts to the graceful shutdown window (#​37765) (6e12447)
• core: Keep a serving external secrets provider active when its replacement fails (#​37882) (1abbd4b)
• core: Prevent Anthropic agent threads from breaking permanently and keep run errors visible (#​37722) (1007dff)
• core: Stop npm audit from stalling Instance AI sandbox setup (#​37877) (6120419)
• core: Stop task broker before task runner processes on shutdown (#​37886) (a8fc772)

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