fix(deps): update dependency @angular/language-server to v21.2.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@angular/language-server (source)	21.2.19 → 21.2.21

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Release Notes

angular/angular (@​angular/language-server)

v21.2.21

Compare Source

platform-browser

Commit	Type	Description
c19a36c2fb	fix	disallow event handler attributes in Meta

v21.2.20

Compare Source

core

Commit	Type	Description
6afe6fa781	fix	sanitize host bindings on concrete hosts

http

Commit	Type	Description
fec5977df4	fix	match header values exactly when deleting
e33d69a71c	fix	preserve immutability of materialized clones
caf616670f	fix	run root interceptors in the terminal request chain

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