Bump x509-limbo and/or wycheproof in CI (#15440)

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

Author: pyca-boringbot[bot]

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

@@ -28,7 +28,7 @@ runs:
         wait "$wycheproof_pid"
         wait "$x509_limbo_pid"
       env:
-        # Latest commit on the wycheproof main branch, as of Jul 21, 2026.
-        WYCHEPROOF_REF: "b61843a9a5115bb758134b6a1f5d5e502d445342" # wycheproof-ref
+        # Latest commit on the wycheproof main branch, as of Aug 12, 2026.
+        WYCHEPROOF_REF: "5722833ca004983abd1a91bcb6c24596d50ac0f9" # wycheproof-ref
         # Latest commit on the x509-limbo main branch, as of Aug 03, 2026.
         X509_LIMBO_REF: "df1688ef13fc068e79db397f04663fc824b10ae8" # x509-limbo-ref