chore(deps): update dependency grpc/grpc-swift to v1.19.1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
grpc/grpc-swift	patch	1.19.0 -> 1.19.1

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Release Notes

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

### [`v1.19.1`](https://togithub.com/grpc/grpc-swift/releases/tag/1.19.1): gRPC Swift 1.19.1 [Compare Source](https://togithub.com/grpc/grpc-swift/compare/1.19.0...1.19.1) ##### SemVer Patch - Update SwiftFormat version ([#​1639](https://togithub.com/grpc/grpc-swift/issues/1639)) - Revert "Adopt h2handler multiplexer ([#​1587](https://togithub.com/grpc/grpc-swift/issues/1587))" ([#​1641](https://togithub.com/grpc/grpc-swift/issues/1641)) - Bump version number to 1.19.1 ([#​1642](https://togithub.com/grpc/grpc-swift/issues/1642))

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