go.mod: require tailscale/breakglass fork for tsapp

Depend on the tailscale/breakglass fork directly for its new
access-control flags. The fork renamed its module path so no replace
directive (disallowed here) is needed. Upstream gokrazy/breakglass
stays for the arm64 appliances.

Regenerate depaware manifests and nix flake hashes for the pkg/sftp
bump pulled in by the fork.

Updates #1866

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>
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