Remove duplicate AUTHORS entry

Change-Id: Ief09e3ab31b8a49bc5e77d0235c20083615b32eb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2573479
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Lutz Vahl <vahl@chromium.org>
Commit-Queue: Lutz Vahl <vahl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71659}

AUTHORS

@@ -28,7 +28,6 @@ IBM Inc. <*@ibm.com>
 Red Hat Inc. <*@redhat.com>
 Samsung <*@*.samsung.com>
 Samsung <*@samsung.com>
-Joyent, Inc <*@joyent.com>
 RT-RK Computer Based System <*@rt-rk.com>
 Amazon, Inc <*@amazon.com>
 ST Microelectronics <*@st.com>