fix(cli): report package version from --version instead of hardcoded 1.0.0 (#320)

commander was wired to a literal '1.0.0' that predated the version scheme,
so --version reported the wrong build. Read version from package.json via
createRequire, matching the pattern in ec2-demo.mjs.

Signed-off-by: Kyle Hounslow <kylhouns@amazon.com>

Author: kylehounslow

aws/cli-installer/src/cli.mjs

@@ -1,6 +1,10 @@
 import { Command } from 'commander';
+import { createRequire } from 'node:module';
 import { DEFAULTS } from './config.mjs';
 
+const require = createRequire(import.meta.url);
+const { version: PKG_VERSION } = require('../package.json');
+
 /**
  * Parse CLI arguments into a config object.
  * Returns null when no flags were given (triggers interactive mode).
@@ -18,7 +22,7 @@ export function parseCli(argv) {
       'Create and manage your observability stack on AWS:\n' +
       'OpenSearch, Prometheus, IAM roles, and ingestion pipelines.'
     )
-    .version('1.0.0');
+    .version(PKG_VERSION);
 
   // Mode
   program