Merge pull request #129 from lightningdevkit/release-0.0.121

Update Package.swift for 0.0.121 release.

Author: arik-so

Package.swift

@@ -1,8 +1,8 @@
 // swift-tools-version:5.3
 import PackageDescription
 
-let tag = "0.0.116"
-let checksum = "2c6e9b4de934e0e23f2439890815372f955c7c8a0316db57acd0408f7647825c"
+let tag = "0.0.121"
+let checksum = "fd811d61354577febb3832deee020b412c9f85955a54d7c9e7794e9ac583e15d"
 let url = "https://github.com/lightningdevkit/ldk-swift/releases/download/\(tag)/LightningDevKit.xcframework.zip"
 
 let package = Package(