Cleanup: Eliminate deprecation warning of context.getScope

[khiga8]

I keep getting deprecation notices when I run the tests.

This PR gets rid of the warnings by migrates away from the deprecated syntax, context.getScope(). I followed the guidance in ESLint for context.getScope. ✨

 PASS  src/rules/__tests__/no-deprecated-entrypoints.test.js
(node:11722) DeprecationWarning: "a11y-explicit-heading" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
 PASS  src/rules/__tests__/a11y-explicit-heading.test.js
 PASS  src/rules/__tests__/no-deprecated-props.test.js
(node:11721) DeprecationWarning: "direct-slot-children" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
 PASS  src/rules/__tests__/direct-slot-children.test.js
(node:11719) DeprecationWarning: "no-system-props" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
 PASS  src/rules/__tests__/no-system-props.test.js
 PASS  src/rules/__tests__/new-color-css-vars.test.js
(node:11717) DeprecationWarning: "non-interactive-tooltip-trigger" rule is using `context.getScope()`, which is deprecated and will be removed in ESLint v9. Please use `sourceCode.getScope()` instead.
(Use `node --trace-deprecation ...` to show where the warning was created)

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[siddharthkp]

Thank you!