Bug: Update context methods to source code methods about eslint-plugin-n

[aladdin-add]

I've made a wip PR, but it's being blocked by eslint-community/eslint-utils#171.

[scagood]

This is a much nicer way to write out what I did in #141! I am going to copy the content here and close it.

Thank you!

---

When we run the tests against eslint v8 we get the following warnings for ESLint v9:

(node:38222) DeprecationWarning: "exports-style" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "global-require" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "global-require" rule is using `context.getAncestors()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getAncestors()` instead.
(node:38222) DeprecationWarning: "handle-callback-err" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-deprecated-api" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-exports-assign" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-extraneous-require" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-hide-core-modules" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-missing-require" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-path-concat" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-restricted-require" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-unpublished-require" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-unsupported-features" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-unsupported-features/es-builtins" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-unsupported-features/es-syntax" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "no-unsupported-features/node-builtins" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "prefer-global/buffer" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "prefer-global/console" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "prefer-global/process" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(node:38222) DeprecationWarning: "prefer-global/text-decoder" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.