fix(deps): upgrade to jsii & typescript 5.9 (#2823)

Author: mrgrain

.projen/deps.json

@@ -58,8 +58,8 @@ const project = new CdklabsJsiiProject({
   },
   autoApproveUpgrades: true,
 
-  jsiiVersion: '5.4.x',
-  typescriptVersion: '5.4.x',
+  jsiiVersion: '5.9.x',
+  typescriptVersion: '5.9.x',
 });
 
 // disable go sumdb so that go deps are resolved directly against github
@@ -78,8 +78,4 @@ project.npmignore?.exclude('/scripts/', '.projenrc.ts');
 // cdklabs-projen-project-types is overzealous about adding this dependency
 project.deps.removeDependency('constructs');
 
-// temporary to
-// to resolve https://github.com/aws/jsii/issues/4658
-project.addDevDeps('[email protected]');
-
 project.synth();