chore: resolve open dependabot security alerts

[jonathannorris]

Summary

Resolved 7 open Dependabot security alerts in test/angular-integration by upgrading vulnerable dependencies.

Dependabot Alerts Resolved

Alert	Package	Severity	Fix
#57	vite	high	Bumped to ^6.4.3 in devDependencies and overrides
#58	vite	medium	Bumped to ^6.4.3 in devDependencies and overrides
#56	@babel/core	low	Added @babel/core: ^7.29.6 override (transitive via @angular/compiler-cli)
#54	@angular/core	high	Upgraded Angular from 19.x to 20.3.25 (no patch exists for 19.x line)
#55	@angular/common	high	Upgraded Angular from 19.x to 20.3.25 (no patch exists for 19.x line)
#53	@angular/common	high	Upgraded Angular from 19.x to 20.3.25 (no patch exists for 19.x line)
#52	@angular/compiler	medium	Upgraded Angular from 19.x to 20.3.25 (no patch exists for 19.x line)

The Angular 19.x vulnerabilities have no patch in the 19.x line; the advisories are fixed in Angular 20.3.25+. The integration test suite has been upgraded to Angular 20 accordingly, along with compatible versions of @openfeature/angular-sdk (1.3.1), @angular/compiler-cli, @analogjs/vitest-angular, and TypeScript (~5.8.0, required by Angular 20).

All 58 integration tests pass after the upgrade.

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