Install this SDK by installing the Swift 6.1 toolchain from https://swift.org/download/#releases and then running the command:
swift sdk install https://source.skip.tools/swift-android-toolchain/releases/download/6.1/swift-6.1-RELEASE-android-24-0.1.artifactbundle.tar.gz --checksum f8696e3e84111b8c2c6f6e564b6266357987ea8d4aa3b2cf92f144357acde1c9