ci(project-sync): add project-sync to lerna package list (#35059)

### Reason for this change

Internal build tool was failing as it could not bump the dependency version automatically for the project-sync tool.

### Description of changes

Added project-sync to list of tools on lerna.

### Describe any new or updated permissions being added

No permissions added.

### Description of how you validated changes

project-sync dependency version bumped when running `sh scripts/align-version.sh`.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: Abogical

lerna.json

@@ -19,6 +19,7 @@
     "tools/@aws-cdk/lazify",
     "tools/@aws-cdk/lambda-integration-test-updater",
     "tools/@aws-cdk/construct-metadata-updater",
+    "tools/@aws-cdk/project-sync",
     "scripts/@aws-cdk/script-tests"
   ],
   "rejectCycles": true,

tools/@aws-cdk/project-sync/package.json

@@ -18,8 +18,7 @@
   },
   "devDependencies": {
     "@aws-cdk/cdk-build-tools": "0.0.0",
-    "@jest/globals": "^30.0.0",
-    "exponential-backoff": "^3.1.2",
+    "exponential-backoff": "^3.1.1",
     "jest": "^29",
     "ts-jest": "^29.4.0",
     "typescript": "~5.5.4"