Support eslint 9

[reosarevok]

Trying to run no-flow-suppressions-in-strict-files (at least) with eslint 9 fails:

Oops! Something went wrong! :(

ESLint: 9.0.0

TypeError: Error while loading rule 'ft-flow/no-flow-suppressions-in-strict-files': context.getAllComments is not a function

This should use sourceCode.getAllComments() now - see https://eslint.org/blog/2023/09/preparing-custom-rules-eslint-v9/
There might be other changes needed.

[Brianzchen]

Hey thanks for raising. This was the only instance of getAllComments() that was missing getSourceCode.

Your issue should be fixed on version v3.0.10 though I cannot guarantee that this plugin completely works on eslint v9 so please keep raising if you find any other issues. A lot of the test infra needs to be overhauled to test against eslint v9 version