[BUG] Nested enum causes "@Slf4j is not supported on non-static nested classes" in 1.18.21 and higher

[mricken]

Describe the bug
When using @Slf4j on a nested enum, I get the following error:

/opt/teamcity/work/f09f56b10202e564/java-sdk/bmc-resourcesearch/src/main/java/com/oracle/bmc/resourcesearch/model/QueryableFieldDescription.java:[100,5] @Slf4j is not supported on non-static nested classes.

The code is here:
https://github.com/oracle/oci-java-sdk/blob/master/bmc-resourcesearch/src/main/java/com/oracle/bmc/resourcesearch/model/QueryableFieldDescription.java#L100

    @lombok.extern.slf4j.Slf4j
    public enum FieldType {

This works in 1.18.20 and lower, but breaks on 1.18.21 and 1.18.22.

To Reproduce
Declare a class with a nested enum in it. Annotate the nested enum with @Slf4j.

To reproduce in our codebase, update this property to 1.18.21 or higher.
https://github.com/oracle/oci-java-sdk/blob/master/pom.xml#L42

Expected behavior
Since an enum is always static, this should compile, just like it did in 1.18.20 and lower.

Version info (please complete the following information):

• Lombok 1.18.21 or higher.
• javac 1.8.0_121

Additional context
None.

[Rawi01]

Thanks for the report, this is a duplicate of #2990