Update dependency grpc/grpc-swift-protobuf to v2

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
grpc/grpc-swift-protobuf	major	from: "1.3.1" -> from: "2.0.0"

[!CAUTION] This PR is marked as draft, as Renovate will not update Package.resolved. See renovatebot/renovate#6924

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Release Notes

grpc/grpc-swift-protobuf (grpc/grpc-swift-protobuf)

v2.0.0

Compare Source

What's Changed

SemVer Major

• Move dependencies to grpc-swift-2 by @​glbrntt in https://github.com/grpc/grpc-swift-protobuf/pull/70

Full Changelog: https://github.com/grpc/grpc-swift-protobuf/compare/1.3.0...2.0.0

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