Fixed build failure

Author: lmeinen

ch-covidcertificate-backend-transformation/ch-covidcertificate-backend-transformation-ws/src/main/java/ch/admin/bag/covidcertificate/backend/transformation/ws/client/VerificationCheckClient.java

@@ -85,7 +85,7 @@ public DccHolder isValid(HCertPayload hCertPayload) throws InterruptedException
      * @param hCertPayload payload as sent with the original request
      * @return the decoded certificate if it decodeable and its signature is valid, null otherwise
      */
-    public DccHolder isValidSig(HCertPayload hCertPayload) {
+    public DccHolder isValidSig(HCertPayload hCertPayload) throws InterruptedException {
         final var verificationResponse = verify(hCertPayload);
         if (verificationResponse != null
                 && (verificationResponse.getSuccessState() != null