security/sops: Unbreak on aarch64

> Building sops from ./cmd/sops

golang.org/x/sys/unix

vendor/golang.org/x/sys/unix/ztypes_freebsd_arm64.go:400:12: undefined: uint128

Unbreak by updating golang.org/x/sys to 33540a1f6037 and golang.org/x/net to
83d349e8ac1a which adds support for freebsd/arm64.

Upstream PR: https://github.com/mozilla/sops/pull/593