Update docker.io/moonrailgun/tianji Docker tag to v1.21.2

No problems upgrading the Docker container with a Docker compose yaml file within Portainer and by means of Portainer DevOps resp. GitOps with dependency update facilitated by Mend's Renovate Bot.

This MR contains the following updates:

Package	Update	Change
docker.io/moonrailgun/tianji	patch	`1.21.0` -> `1.21.2`

Release Notes

msgbyte/tianji (docker.io/moonrailgun/tianji)

`v1.21.2`

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Bug Fixes

fix sonnet mode will output invalid json problem (94ce294)

Document

add api related documents (850b642)

`v1.21.1`

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Features

add a function which make sure we can get json response from LLM output even mode not support json mode (411c285)
add new routes and CommonPageEmpty component for various sections (b5df979)
wrap Empty component in DelayRender for improved loading experience in CommonPageEmpty (fedb7f9)