fix(deps): peer dependencies are never direct

there’s no value in having the same dependency
declared as both direct and peer

.changeset/chilled-jeans-wink.md

@@ -0,0 +1,9 @@
+---
+"@guardian/cdk": patch
+---
+
+Remove direct dependencies that should be peer ones:
+- `aws-cdk-lib`
+- `constructs`
+
+No change for consumers that provide compatible packages

package.json

@@ -41,6 +41,8 @@
     "@types/node": "20.11.5",
     "@types/yargs": "^17.0.32",
     "aws-cdk": "2.121.1",
+    "aws-cdk-lib": "2.121.1",
+    "constructs": "10.3.0",
     "cz-conventional-changelog": "^3.3.0",
     "eslint": "^8.56.0",
     "eslint-plugin-custom-rules": "file:tools/eslint",
@@ -55,11 +57,9 @@
   },
   "dependencies": {
     "@oclif/core": "2.15.0",
-    "aws-cdk-lib": "2.121.1",
     "aws-sdk": "^2.1538.0",
     "chalk": "^4.1.2",
     "codemaker": "^1.94.0",
-    "constructs": "10.3.0",
     "git-url-parse": "^14.0.0",
     "js-yaml": "^4.1.0",
     "lodash.camelcase": "^4.3.0",
@@ -78,4 +78,4 @@
       "path": "./node_modules/cz-conventional-changelog"
     }
   }
-}
+}