Update docker.io/moonrailgun/tianji Docker tag to v1.19.7

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	`1.19.6` -> `1.19.7`

Release Notes

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

`v1.19.7`

Compare Source

Features

add workspace invitation which allow user invite non-register user #180 (32d52ae)

Document

add MCP integration and environment variable documentation (aefb090)
add social icons (a9bee2a)

Others

enhance email template and consolidate SMTP logic (b2a384c)