fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-6612984
- https://snyk.io/vuln/SNYK-JAVA-COMNIMBUSDS-6247633
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-6613076
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-6613079
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-8230364
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-8230365

pom.xml

@@ -129,7 +129,7 @@
       <dependency>
         <groupId>se.idsec.signservice.commons</groupId>
         <artifactId>signservice-commons</artifactId>
-        <version>2.0.0</version>
+        <version>2.1.1</version>
       </dependency>
 
       <dependency>