Bump x509-limbo and/or wycheproof in CI (#14761)

Co-authored-by: pyca-boringbot[bot] <pyca-boringbot[bot]+106132319@users.noreply.github.com>

Author: pyca-boringbot[bot]

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

@@ -9,14 +9,14 @@ runs:
       with:
         repository: "C2SP/wycheproof"
         path: "wycheproof"
-        # Latest commit on the wycheproof main branch, as of Apr 22, 2026.
-        ref: "744697a257d41941320b4ea10987b85b25f8c8bc" # wycheproof-ref
+        # Latest commit on the wycheproof main branch, as of Apr 28, 2026.
+        ref: "acd97b29f7cc5145772a6d302901b2d2dc330da7" # wycheproof-ref
         persist-credentials: false
 
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
       with:
         repository: "C2SP/x509-limbo"
         path: "x509-limbo"
-        # Latest commit on the x509-limbo main branch, as of Apr 27, 2026.
-        ref: "d30e3f9641d739b9188796d53cd5022e669bb224" # x509-limbo-ref
+        # Latest commit on the x509-limbo main branch, as of Apr 28, 2026.
+        ref: "086b0da8b83d78ed0f491d6df6672b2673406500" # x509-limbo-ref
         persist-credentials: false