feat: upgrade to jsii 0.20.7

[eladb]

Bug Fixes

• java: handle null-able collections correctly (cdk bootstrap - no destroy option #986) (e88e5e2), closes NullPointerException when using CfnApi::getBinaryMediaTypes from Java #4316
• jsii: unable to depend on modules with private declarations ('cdk deploy' default output is too noisy  #995) (08c4294), closes docs: fixing EC2 README for NAT GW #994
• kernel: cannot pass decorated structs to kernel as "any" (fix(docs): updates to contribution guide #997) (2bd3183), closes java (dotnet?) regression: unable to use structs with escape hatches #5066

Features

• jsii-config: introducing jsii-config (BucketDeployment updates are broken #981) (2bbf576), closes fix(cdk): init templates were not upgraded to typescript ^3.0.0 #904
• rosetta: extract and compile samples into "tablets" (feat(aws-codedeploy): add auto rollback configuration to server Deployment Group #925) (eec44e1)

---

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