fix: upgrade org.yaml:snakeyaml from 2.0 to 2.1

Snyk has created this PR to upgrade org.yaml:snakeyaml from 2.0 to 2.1.

See this package in Maven Repository:
https://mvnrepository.com/artifact/org.yaml/snakeyaml/

See this project in Snyk:
https://app.snyk.io/org/st3v0rr/project/b05cc1c7-f375-446c-b681-f981b0c66285?utm_source=github&utm_medium=referral&page=upgrade-pr

pom.xml

@@ -5,7 +5,7 @@
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>2.7.13</version>
-        <relativePath />
+        <relativePath/>
     </parent>
 
     <groupId>de.adorsys.keycloak</groupId>
@@ -85,7 +85,7 @@
         <pmd.version>6.55.0</pmd.version>
         <reproducible-build-maven-plugin.version>0.15</reproducible-build-maven-plugin.version>
         <resteasy.version>6.2.4.Final</resteasy.version>
-        <snakeyaml.version>2.0</snakeyaml.version>
+        <snakeyaml.version>2.1</snakeyaml.version>
         <jakarta.ws.rs-api.version>3.1.0</jakarta.ws.rs-api.version>
         <jakarta.activation.version>2.1.2</jakarta.activation.version>
         <jakarta.annotation.version>2.1.1</jakarta.annotation.version>
@@ -103,7 +103,7 @@
         <sonar.host.url>https://sonarcloud.io</sonar.host.url>
 
         <release.signTag>true</release.signTag>
-        <release.additionalArguments />
+        <release.additionalArguments/>
 
         <argLine>
             --add-exports=java.base/sun.security.x509=ALL-UNNAMED