chore(deps): update dependency grpc/grpc-swift to v1.20.0

[renovate]

This PR contains the following updates:

Package	Update	Change
grpc/grpc-swift	minor	1.19.1 -> 1.20.0

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Release Notes

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

v1.20.0: gRPC Swift 1.20.0

Compare Source

SemVer Minor

• Drop support for Swift 5.6 (#​1657)
• Make the connection pool error public (#​1685)
• Allow binding to a socket address via the server builder (#​1686)
• Add convenience methods to keepalive to jitter the interval (#​1697)

SemVer Patch

• Switch to swift-format and re-format (#​1655)
• Add missing deque import (#​1670)
• Add support for package visibility modifier to the code generator (#​1674)
• Additional keepalive diagnostics (#​1692)
• Fix last peer initiated stream ID when quiescing (#​1700)
• Bump version number to 1.20.0 (#​1701)

Other Changes

• Fix soundness script (#​1676)
• Multiple changes in preparation to support the reflection service (#​1675,
  #​1695, #​1659, #​1677, #​1680, #​1682, #​1669, #​1654)
• Multiple changes working towards v2 (#​1652, #​1656, #​1660, #​1664, #​1665, #​1666, #​1667, #​1668, #​1671, #​1672, #​1678, #​1681, #​1683, #​1684, #​1687, #​1688, #​1689, #​1690, #​1691, #​1693, #​1696, #​1698)

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