Switch from `eslint-plugin-jsx-expressions` to `@eslint-react/no-leaked-conditional-rendering`

[karlhorky]

Since eslint-plugin-jsx-expressions is not being maintained as much and doesn't support ESLint v9, switch eslint-plugin-jsx-expressions to the @eslint-react/no-leaked-conditional-rendering rule

• feat(#16): update typescript-eslint dependencies hluisson/eslint-plugin-jsx-expressions#17 (comment)

Then the vendor directory can be removed

And eslint-config-upleveled can be added to the "Who is Using" list:

• https://github.com/Rel1cx/eslint-react#who-is-using

Show original issue

Title: Consider switching from eslint-plugin-jsx-expressions to @typescript-eslint/strict-boolean-expressions

Since eslint-plugin-jsx-expressions is not being maintained as much and doesn't support ESLint v9, consider switching from eslint-plugin-jsx-expressions to @typescript-eslint/strict-boolean-expressions

• feat(#16): update typescript-eslint dependencies hluisson/eslint-plugin-jsx-expressions#17 (comment)

Then the vendor directory can be removed

Could be a downside for students though, since it will be reported also on if conditions

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