Update docker.io/livekit/livekit-server Docker tag to v1.13.7 (#5598)

Co-authored-by: mdad-renovate[bot] <322784800+mdad-renovate[bot]@users.noreply.github.com>

molecule-shared/vars.yml

@@ -23,4 +23,4 @@ molecule_shared_image_postgres: "docker.io/library/postgres:18.6-alpine"
 
 # Real SFU for the LiveKit JWT service's room creation and publishing grants.
 # renovate: datasource=docker depName=docker.io/livekit/livekit-server
-molecule_shared_image_livekit_server: "docker.io/livekit/livekit-server:v1.13.6"
+molecule_shared_image_livekit_server: "docker.io/livekit/livekit-server:v1.13.7"