Change in SimpleGrantedAuthority#equals

[croissant676]

Prevent NPE when calling equals with parameter null

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[jzheaux]

Thanks, @croissant676, for the contribution. For it to be accepted, please do the following:

• Ensure it meets the formatting guidelines (check out the project locally and run ./gradlew format check)
• Add a test that fails before your fix, but passes after your fix

[jzheaux]

@croissant676, looking at this more closely, it appears to be unnecessary. In fact, when I create a test like so:

assertThat(new SimpleGrantedAuthority("ROLE_TEST").equals(null)).isFalse()

the test passes just fine since the instanceof returns false.

Because of that, I'm going to decline this PR. That said, if you can add a test that demonstrates the need for the change, I'm happy to reopen.