Bump x509-limbo and/or wycheproof in CI (#12961)

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

Author: pyca-boringbot[bot]

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

@@ -9,12 +9,12 @@ runs:
       with:
         repository: "C2SP/wycheproof"
         path: "wycheproof"
-        # Latest commit on the wycheproof main branch, as of May 02, 2025.
-        ref: "df4e933efef449fc88af0c06e028d425d84a9495" # wycheproof-ref
+        # Latest commit on the wycheproof main branch, as of May 21, 2025.
+        ref: "4a6c2bf5dc4c0b67c770233ad33961ee653996a0" # wycheproof-ref
 
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       with:
         repository: "C2SP/x509-limbo"
         path: "x509-limbo"
-        # Latest commit on the x509-limbo main branch, as of May 20, 2025.
-        ref: "742702ed5930065aafc461c0232802c6a0d1e992" # x509-limbo-ref
+        # Latest commit on the x509-limbo main branch, as of May 21, 2025.
+        ref: "72afb4cc77a1a663e5981e8261a56b93fb05f441" # x509-limbo-ref