Upgrade to SnakeYAML 1.30 release

pom.xml

@@ -70,21 +70,6 @@
         </repository>
     </distributionManagement>
 
-    <!-- We really shouldn't depend on external repositories, but at least this is the Central staging one -->
-    <repositories>
-        <repository>
-            <id>sonatype-nexus-snapshots</id>
-            <name>Sonatype Nexus Snapshots</name>
-            <url>https://oss.sonatype.org/content/repositories/snapshots/</url>
-            <releases>
-                <enabled>false</enabled>
-            </releases>
-            <snapshots>
-                <enabled>true</enabled>
-            </snapshots>
-        </repository>
-    </repositories>
-
     <properties>
         <build.number>unknown</build.number>
         <lombok.version>1.18.20</lombok.version>