Bump swift-he version (#16)

Author: karulont

Package.resolved

@@ -35,7 +35,7 @@ let package = Package(
         .package(url: "https://github.com/apple/swift-asn1.git", from: "1.0.0"),
         .package(url: "https://github.com/apple/swift-crypto.git", from: "3.5.0"),
         .package(url: "https://github.com/swiftlang/swift-docc-plugin", from: "1.0.0"),
-        .package(url: "https://github.com/apple/swift-homomorphic-encryption", exact: "1.0.0-alpha.2"),
+        .package(url: "https://github.com/apple/swift-homomorphic-encryption", exact: "1.0.0-alpha.3"),
         .package(url: "https://github.com/apple/swift-protobuf.git", from: "1.27.0"),
         .package(url: "https://github.com/hummingbird-project/hummingbird", exact: "2.0.0-rc.2"),
     ],