Add updated cpe for vulnerability scanners

Bug: b/201572953
Change-Id: I06d0b38a156d5e05c60003cb9f173096714c601c
diff --git a/METADATA b/METADATA
index f0dbb17..c563913 100644
--- a/METADATA
+++ b/METADATA
@@ -16,4 +16,7 @@
     month: 10
     day: 29
   }
+  security {
+    tag: "NVD-CPE2.3:cpe:/a:pcre:pcre2"
+  }
 }