Bump x509-limbo and/or wycheproof in CI (#14050)

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

Author: pyca-boringbot[bot]

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

@@ -17,6 +17,6 @@ runs:
       with:
         repository: "C2SP/x509-limbo"
         path: "x509-limbo"
-        # Latest commit on the x509-limbo main branch, as of Dec 19, 2025.
-        ref: "4a08aa6ef8849f632ac452e74edf07a1175d219d" # x509-limbo-ref
+        # Latest commit on the x509-limbo main branch, as of Dec 23, 2025.
+        ref: "715f3fe57fdc14dd6fad0d8ab1f58f85fa5282f8" # x509-limbo-ref
         persist-credentials: false