Replace heavyweight aws-java-sdk with fine-grained aws-java-sdk-ec2

[Vlatombe]

Since 1.12.70, the aws-java-sdk plugin has been split into multiple fine-grained plugins.

This pull request replaces the heavyweight aws-java-sdk (195Mb) with a fine-grained aws-java-sdk-ec2 dependency.

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[Vlatombe]

Ping @escoem fyi