Add security CPE tag for Python 3.13.1.

Bug: 432520108
Change-Id: I23d44a0740b8a869a581bb00085f2d740051ba26

METADATA

diff --git a/METADATA b/METADATA
index 7f6037f..29917d3 100644
--- a/METADATA
+++ b/METADATA
@@ -16,5 +16,8 @@
     month: 1
     day: 15
   }
+  security: {
+    tag: "NVD-CPE2.3:cpe:/a:python:python:3.13.1"
+  }
 }