Use java.util.Set.of for creation of unmodifiable sets

[wilkinsona]

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[aravindbargurhiriyannaiah]

Hello @wilkinsona I wanted to contribute to this task.

I have not contributed to open source till now. I wanted to start off with something small. Can you please let me know if this is good to start?

[snicoll]

@aravindbargurhiriyannaiah thanks for the offer but this one isn't a great candidate, see https://github.com/spring-projects/spring-boot/issues/28179#issuecomment-935542941

[aravindbargurhiriyannaiah]

@snicoll Thanks for the comment. Shall browse through and pick up something else.

[mbhave]

Placing on hold for the same reason as #28174.

[philwebb]

I think we can close this one and adapt to Set.of in new code or when we touch existing classes. Doing an entire sweep at this point doesn't seem worth it.