chore(deps): update dependency grpc/grpc-swift to v1.13.1

[renovate]

This PR contains the following updates:

Package	Update	Change
grpc/grpc-swift	patch	1.13.0 -> 1.13.1

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Release Notes

grpc/grpc-swift

v1.13.1: gRPC Swift 1.13.1

Compare Source

SemVer Patch

• Fix a client bug where the HTTP/2 max frame size was incorrectly set as the HTTP/2 target window size (#​1528)
• Use #fileID/#filePath instead of #file (#​1518)
• Make request/response parts conditionally Sendable (#​1523)
• Avoid copies of large payloads (#​1529, #​1530)
• Delay client async writer starting (#​1531)
• Bump version number to 1.13.1 (#​1532)

Other Changes

• Update quick-start.md (#​1527, patch credit to @​compoundradius)
• Update test certs (#​1522)

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