fix(deploy): bump @aws-cdk/toolkit-lib to read cloud-assembly schema 54 (#1465)

aws-cdk-lib@2.258.0 (published 2026-06-04) bundles
cloud-assembly-schema ^54.0.0, so freshly-created CDK projects now write
schema-54 manifests. The CLI's bundled @aws-cdk/toolkit-lib@1.24.0 reads
only up to schema 53, so synth fails with AssemblyVersionMismatch
("Maximum schema version supported is 53.x.x, but found 54.0.0").

Bump @aws-cdk/toolkit-lib ^1.16.0 -> ^1.28.0 (resolves the bundled reader
to 1.28.0, whose nested cloud-assembly-schema is 54.2.0) and regenerate
npm-shrinkwrap.json. 1.28.0 reads schema 54 and all of 53 — forward
compatible — and is an API-compatible drop-in (no source changes).

Also bump the generated template's aws-cdk devDep 2.1100.1 -> 2.1126.0 so
the manual `npm run cdk` escape hatch can also read schema 54.

Verified by reproducing the customer scenario: a fresh project resolving
aws-cdk-lib@2.258.0 writes a 54.0.0 manifest, and `agentcore deploy
--dry-run` now synthesizes cleanly (Synthesize CloudFormation: SUCCESS).

Author: aidandaly24

npm-shrinkwrap.json

@@ -75,7 +75,7 @@
     "bundle": "node scripts/bundle.mjs"
   },
   "dependencies": {
-    "@aws-cdk/toolkit-lib": "^1.16.0",
+    "@aws-cdk/toolkit-lib": "^1.28.0",
     "@aws-sdk/client-application-signals": "^3.1003.0",
     "@aws-sdk/client-bedrock": "^3.1012.0",
     "@aws-sdk/client-bedrock-agent": "^3.1012.0",

package.json

@@ -414,7 +414,7 @@ exports[`Assets Directory Snapshots > CDK assets > cdk/cdk/package.json should m
     "@types/node": "^24.10.1",
     "jest": "^29.7.0",
     "ts-jest": "^29.2.5",
-    "aws-cdk": "2.1100.1",
+    "aws-cdk": "2.1126.0",
     "prettier": "^3.4.2",
     "typescript": "~5.9.3"
   },

src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap

@@ -18,7 +18,7 @@
     "@types/node": "^24.10.1",
     "jest": "^29.7.0",
     "ts-jest": "^29.2.5",
-    "aws-cdk": "2.1100.1",
+    "aws-cdk": "2.1126.0",
     "prettier": "^3.4.2",
     "typescript": "~5.9.3"
   },