Change the variant `Lit` in `JsxAttrValue` into `Str`

[bvanjoi]

We should change Lit to Str because the other variants do not represent valid syntax.

swc/crates/swc_ecma_ast/src/jsx.rs

Lines 192 to 198 in e1f2597

	#[tag("StringLiteral")]
	#[tag("BooleanLiteral")]
	#[tag("NullLiteral")]
	#[tag("NumericLiteral")]
	#[tag("RegExpLiteral")]
	#[tag("JSXText")]
	Lit(Lit),

reference:

https://github.com/microsoft/TypeScript/blob/355b9e0984671f7eea9040f0ac8b68c16361729a/src/compiler/types.ts#L3282