deps: bump golang.org/x/sys 0.27.0 → 0.47.0

[terraboops]

What

Dependency refresh for pin-cli. One update was available:

• golang.org/x/sys 0.27.0 → 0.47.0 (indirect, via zalando/go-keyring → godbus/dbus)

go get -u ./... also rewrote the go directive from 1.25 to 1.25.0. Reverted — that changes toolchain-selection semantics for no benefit, and isn't part of a dependency refresh.

stretchr/testify and stretchr/objx show up in go list -m -u all but aren't in this module's requirements (they arrive through a dependency's own test tree), so there is nothing to bump for them here.

Test evidence

go build ./...        clean
go vet ./...          clean
go test -count=1 ./... ok  github.com/bitcomplete/pin-cli  0.270s

-count=1 to defeat the test cache — this is a real run, not a cached pass.