Kotlin stdlib should not be a pom dep

[bbakerman]

See #227

Local maven publish says

<dependencies> <dependency> <groupId>org.reactivestreams</groupId> <artifactId>reactive-streams</artifactId> <version>1.0.3</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.jspecify</groupId> <artifactId>jspecify</artifactId> <version>1.0.0</version> <scope>compile</scope> </dependency> </dependencies> <name>java-dataloader</name> <description>A pure Java 11 port of Facebook Dataloader</description> <url>https://github.com/graphql-java/java-dataloader</url> <inceptionYear>2017</inceptionYear>