chore: apply v2 trove classifier on v2 python packages (#19630)

Those are currently incorrectly listed against version 1 of the
Framework :: AWS CDK trove classifier. This changes so the v2 branch
correctly uses version 2 here.


----

### All Submissions:

* [X] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/master/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/master/INTEGRATION_TESTS.md)?
	* [ ] Did you use `cdk-integ` to deploy the infrastructure and generate the snapshot (i.e. `cdk-integ` without `--dry-run`)?

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

Author: RomainMuller

tools/@aws-cdk/pkglint/lib/rules.ts

@@ -809,7 +809,7 @@ export class JSIIPythonTarget extends ValidationRule {
 
     expectJSON(this.name, pkg, 'jsii.targets.python.distName', moduleName.python.distName);
     expectJSON(this.name, pkg, 'jsii.targets.python.module', moduleName.python.module);
-    expectJSON(this.name, pkg, 'jsii.targets.python.classifiers', ['Framework :: AWS CDK', 'Framework :: AWS CDK :: 1']);
+    expectJSON(this.name, pkg, 'jsii.targets.python.classifiers', ['Framework :: AWS CDK', `Framework :: AWS CDK :: ${cdkMajorVersion()}`]);
   }
 }