Changes

fix(tekton/v1): fix payload variable name for image version (#3894)

This pull request makes a small fix to the payload construction in the
`pingcap-notify-to-update-ops-tidbx.yaml` Tekton task, ensuring the
correct variable is used for the `version` field. This helps prevent
inconsistencies when the payload is sent for image update notifications.

* Fixed the payload to use the correct `$version` variable instead of
`$component_version` for the `version` field in the JSON body.
 (commit: 777723c)