refactor(core): mark VERSION as @__PURE__ for better tree-shaking (angular#63400)

Annotate the `new Version(...)` call with `/* @__PURE__ */` to signal to
optimizers that the constructor is side-effect free.

Without this hint, bundlers such as Terser or ESBuild may conservatively
retain the `VERSION` instantiation even when unused. With the annotation,
the constant can be tree-shaken away in production builds if not referenced,
reducing bundle size.

PR Close angular#63400

Author: arturovt

packages/core/src/version.ts

@@ -27,4 +27,4 @@ export class Version {
 /**
  * @publicApi
  */
-export const VERSION = new Version('0.0.0-PLACEHOLDER');
+export const VERSION = /* @__PURE__ */ new Version('0.0.0-PLACEHOLDER');