Use Java 17

[bbakerman]

Move to Java 17

java-dataloader % javap -verbose -classpath build/libs/java-dataloader-0.0.0-2026-10-20T10-41-14-da59d1d.jar org.dataloader.DataLoader
Classfile jar:file:///Users/bbaker/src/graphql/java-dataloader/build/libs/java-dataloader-0.0.0-2026-10-20T10-41-14-da59d1d.jar!/org/dataloader/DataLoader.class
  Last modified 1 Feb. 1980; size 14398 bytes
  MD5 checksum ecf88b49c3c18c71f84d50cb7bc3617e
  Compiled from "DataLoader.java"
public class org.dataloader.DataLoader<K extends java.lang.Object, V extends java.lang.Object> extends java.lang.Object
  minor version: 0
  major version: 61
  

Major version 61 is Java 17