fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHESANTUARIO-6017551
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-5771340

pom.xml

@@ -139,7 +139,7 @@
       <dependency>
         <groupId>se.idsec.signservice.commons</groupId>
         <artifactId>signservice-commons</artifactId>
-        <version>1.2.4</version>
+        <version>2.0.0</version>
       </dependency>
 
       <dependency>