libtiff: Update RELEASE-DATE

From 8b20804fc0ddeaa93667b799b5e1a2a7dc9e3fb2 Mon Sep 17 00:00:00 2001
From: Even Rouault <[EMAIL REDACTED]>
Date: Fri, 8 Sep 2023 11:12:35 +0200
Subject: [PATCH] Update RELEASE-DATE

---
 RELEASE-DATE | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/RELEASE-DATE b/RELEASE-DATE
index 81d28a37..68d94343 100644
--- a/RELEASE-DATE
+++ b/RELEASE-DATE
@@ -1 +1 @@
-20230905
+20230908