Update dependency @lezer/javascript to v1.4.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@lezer/javascript	1.4.19 -> 1.4.21

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Release Notes

lezer-parser/javascript (@​lezer/javascript)

v1.4.21

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Bug fixes

Add support for const modifiers on TypeScript type parameters.

Allow TypeScript syntax, where the condition is just a variable.

Fix a bug where some TypeScript < tokens didn't appear in the syntax tree.

v1.4.20

Compare Source

Bug fixes

Use the className style tag for variable names used as constructors with new.

Add support for asserts syntax in function return types.

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