Add fallback-version for certifi 2023.5.7

Looks like Synopsys changed the Knowledgebase entry from "2023.5.7"
to "2023.05.07", making our scans fail.

Change-Id: I6859e158b6e6e95682bc25e804eeda6eff6ea294
Reviewed-on: https://review.couchbase.org/c/build-tools/+/195150
Tested-by: Chris Hillery <[email protected]>
Reviewed-by: Chris Hillery <[email protected]>

Author: ceejatec

blackduck/jenkins/detect-scan/bd_aliases.yaml

@@ -51,3 +51,8 @@
 "4c1ff009-d3b6-4f0c-8c3c-fd810d1b8d5c":
   bd-id-aliases:
     - "a38e1dc0-f53d-4dc1-adb4-6328fc424fb5"
+
+# python-certifi / certifi
+"f1890115-04dd-4eaf-8ff0-5e2643582990":
+  fallback-versions:
+    "2023.5.7": "2023.05.07"