(neptune): grantConnect() creates incorrect resource ARN

[christophgysin]

When using cluster.grantConnect() on a Neptune cluster, the created IAM statement uses an incorrect ARN.

Reproduction Steps

const cluster = new neptune.DatabaseCluster(this, 'Cluster', {
  vpc,
  instanceType: neptune.InstanceType.T3_MEDIUM,
});
const role = new iam.Role(this, 'DBRole', { assumedBy: new iam.AccountPrincipal(this.account) });
cluster.grantConnect(role);

What did you expect to happen?

DBRole is allowed to connect.

What actually happened?

DBRole is not allowed to connect.

Environment

• CDK CLI Version: 1.94.1
• Framework Version: 1.94.1
• Node.js Version: v14.16.0
• OS: linux
• Language (Version): all

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This is 🐛 Bug Report

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