Bump x509-limbo and/or wycheproof in CI (#12107)

Co-authored-by: pyca-boringbot[bot] <pyca-boringbot[bot][email protected]>

Author: pyca-boringbot[bot]

.github/actions/fetch-vectors/action.yml

@@ -16,5 +16,5 @@ runs:
       with:
         repository: "C2SP/x509-limbo"
         path: "x509-limbo"
-        # Latest commit on the x509-limbo main branch, as of Dec 03, 2024.
-        ref: "960f0edbdd7785c6e48d7c9b5b63cdad18e1b2a5" # x509-limbo-ref
+        # Latest commit on the x509-limbo main branch, as of Dec 06, 2024.
+        ref: "b9406ff8eb6ccaf5b148d09eb52fccdad706e0c0" # x509-limbo-ref