Bump n8n to 1.123.51

[github-actions]

Summary

Automated bump of default n8n version from stable to 1.123.51.

• Updated image.tag in values.yaml
• Updated appVersion in Chart.yaml
• Updated N8N_VERSION in Docker Compose .env files

Release notes: https://github.com/n8n-io/n8n/releases/tag/n8n%401.123.51

This PR was created automatically by the bump-n8n-version workflow.

---

Summary by cubic

Pins default n8n version to 1.123.51 in Helm and Docker Compose for reproducible deployments and consistent rollouts.

• Dependencies
  • Helm: set appVersion and image.tag to 1.123.51.
  • Docker Compose: set N8N_VERSION to 1.123.51 in docker-caddy/.env, docker-compose/subfolderWithSSL/.env, docker-compose/withPostgres/.env, and docker-compose/withPostgresAndWorker/.env.

^{Written for commit 633f163. Summary will update on new commits.}

[krider2010]

Closing this — we moved the chart and compose defaults to the rolling stable tag, so pinning a specific upstream version here would undo that. I'm removing the bump-n8n-version workflow in #152 so we don't keep getting these PRs every week.