Update dependencies

[xanderdunn]

swift-package-manager no longer has SPMUtility, it was moved to swift-tools-support-core and named TSCUtility.

tensorflow/swift no longer has a master branch, it was renamed to main.

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[xanderdunn]

I just submitted the CLA.

[xanderdunn]

swift-tools-support-core depends on sqlite.h, so this has the undesirable effect of requiring a sqlite header installation: sudo apt-get install libsqlite3-dev. However, this does fix the build on Linux. Fixes #23

[apaszke]

I still see the repo at the original URL. Why is this change needed?

[apaszke]

BTW if you feel like it then really an ideal fix would be to just use a different library for argument parsing.