[CE/SP] Rebuild base image (#28727)

Update epoch ENV to trigger a rebuild

GitOrigin-RevId: 5c46547cc1699e3ad916477107a7c035984ac423

server-ce/Dockerfile-base

@@ -10,7 +10,7 @@ ENV TEXMFVAR=/var/lib/overleaf/tmp/texmf-var
 
 # Update to ensure dependencies are updated
 # ------------------------------------------
-ENV REBUILT_AFTER="2025-05-19"
+ENV REBUILT_AFTER="2025-09-26"
 
 # Install dependencies
 # --------------------