fix: align aws-cdk-lib peer dependency with @aws/agentcore-cdk ^2.243.0 (#582)

The CDK constructs package requires aws-cdk-lib ^2.243.0 (for
aws-bedrockagentcore module), but the CLI declared ^2.234.1. This
caused unresolvable dependency conflicts for customers installing both
packages. Bump peer and dev dependencies to ^2.243.0 to match.

Author: notgitika

package.json

@@ -94,7 +94,7 @@
     "zod": "^4.3.5"
   },
   "peerDependencies": {
-    "aws-cdk-lib": "^2.234.1",
+    "aws-cdk-lib": "^2.243.0",
     "constructs": "^10.0.0"
   },
   "devDependencies": {
@@ -108,7 +108,7 @@
     "@typescript-eslint/parser": "^8.50.0",
     "@vitest/coverage-v8": "^4.0.18",
     "@xterm/headless": "^6.0.0",
-    "aws-cdk-lib": "^2.240.0",
+    "aws-cdk-lib": "^2.243.0",
     "constructs": "^10.4.4",
     "esbuild": "^0.27.2",
     "eslint": "^9.39.4",