update-flake.sh: tooling to keep Nix SRI hashes in sync.

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Also fixes the Go toolchain SRI hash from a7f05c6bb0,
it turns out I initialized the file with an SRI hash for an older
toolchain version, and because of the unique way fixed-output derivations
work in nix, nix didn't tell me about the mismatch because it just
cache-hit on the older toolchain and moved on. Sigh.

Updates #6845.

Signed-off-by: David Anderson <danderson@tailscale.com>

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