Deprecated String.prototype.substr() in robot-name.test.ts

[Ak5cel]

There's currently 4 instances of String.prototype.substr() in robot-name.test.ts. It's been deprecated, so it could be refactored to use String.prototype.slice() instead.

typescript/exercises/practice/robot-name/robot-name.test.ts

Lines 4 to 7 in f7ec7e0

	const alpha1 = name1.substr(0, 2)
	const alpha2 = name2.substr(0, 2)
	const num1 = Number(name1.substr(2, 3))
	const num2 = Number(name2.substr(2, 3))

Wouldn't mind making a PR for it as a first issue if it were to be changed :)

[github-actions]

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