Please add `v1_18` for `ApiVersion.Target` plugin annotations. Making constructor public would also be nice, in case anyone want to use some custom/new API version without waiting for update.

https://hub.spigotmc.org/stash/projects/SPIGOT/repos/plugin-annotations/browse/src/main/java/org/bukkit/plugin/java/annotation/plugin/ApiVersion.java

Example:
```java
@Plugin(name = "MyPlugin", version = "0.1")
@ApiVersion(ApiVersion.Target.v1_18) // Error, v1_18 does not exist currently :C
public class MyPlugin extends JavaPlugin
//...
```