fix(deps): update dependency ch.admin.bag.covidcertificate:sdk-core to v3.1.0

Author: renovate-bot

ch-covidcertificate-backend-verification-check/ch-covidcertificate-backend-verification-check-ws/pom.xml

@@ -74,7 +74,7 @@
         <dependency>
             <groupId>ch.admin.bag.covidcertificate</groupId>
             <artifactId>sdk-core</artifactId>
-            <version>3.0.4</version>
+            <version>3.1.0</version>
         </dependency>
 
         <dependency>