Upgrade: Java 21, maven build plug-ins, vertx 4. #7
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Upgrading to Java 21 so the build can be tested without needing Java 8 installed.
Upgrading maven build plug-ins to work around these warnings
[WARNING] Map in class org.apache.maven.plugins.shade.resource.ManifestResourceTransformer declares value type as: class java.util.jar.Attributes but saw: class java.lang.String at runtime [WARNING] Map in class org.apache.maven.plugins.shade.resource.ManifestResourceTransformer declares value type as: class java.util.jar.Attributes but saw: class java.lang.String at runtimeThis may or may not be the problem that breaks the build in the workflow.
Upgrading Vert.X from 3.9.16 to 4.5.20 for vulnerabilities.