Mark CVE-2023-52355 as mitigated in third_party/libtiff/METADATA

Since there are no callers to TIFFRasterScanlineSize() and
TIFFRasterScanlineSize64() in this code base, the potential OOM issue
cannot occur.

Bug: 323286416
Change-Id: I6d1882cac97d8cb152bc6539a5da2c25ab7d2196
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/116292
Reviewed-by: Thomas Sepez <tsepez@google.com>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Thomas Sepez <tsepez@google.com>

third_party/libtiff/METADATA

diff --git a/third_party/libtiff/METADATA b/third_party/libtiff/METADATA
index 7d36a06..7956a6f 100644
--- a/third_party/libtiff/METADATA
+++ b/third_party/libtiff/METADATA
@@ -15,5 +15,8 @@
     mitigated_security_patch: "CVE-2023-26965"
     mitigated_security_patch: "CVE-2023-40745"
     mitigated_security_patch: "CVE-2023-41175"
+
+    # There are no callers to TIFFRasterScanlineSize() in PDFium's code base.
+    mitigated_security_patch: "CVE-2023-52355"
   }
 }