fix!: remove deprecated `SourceCode` methods #3774

Job	Run time
Types (neostandard)	1m 1s
Types (eslint-flat-config-utils)	1m 15s
Types (@eslint/json)	1m 9s
Types (eslint-visitor-keys)	1m 20s
Are the types wrong? (eslint-config-eslint, packages/eslint-config-eslint)	23s
Are the types wrong? (eslint, .)	1m 1s
Types (eslint-webpack-plugin)	0s
	6m 9s

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