fix(deps): update buildkite to v5 (#848)

Author: renovate[bot]

go.mod

@@ -6,6 +6,7 @@ require (
 	github.com/alecthomas/kong v1.15.0
 	github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be
 	github.com/buildkite/go-buildkite/v4 v4.23.0
+	github.com/buildkite/go-buildkite/v5 v5.0.0
 	github.com/buildkite/termoji v0.0.0-20260330080310-c0aa4ebee0d1
 	github.com/charmbracelet/bubbles v1.0.0
 	github.com/charmbracelet/bubbletea v1.3.10

go.sum

@@ -35,6 +35,7 @@ github.com/bradleyjkemp/cupaloy/v2 v2.6.0 h1:knToPYa2xtfg42U3I6punFEjaGFKWQRXJwj
 github.com/bradleyjkemp/cupaloy/v2 v2.6.0/go.mod h1:bm7JXdkRd4BHJk9HpwqAI8BoAY1lps46Enkdqw6aRX0=
 github.com/buildkite/go-buildkite/v4 v4.23.0 h1:GlLgPzGz/+B/4Fc5CphIxynoQn00SdSu6QQp4PlAI3M=
 github.com/buildkite/go-buildkite/v4 v4.23.0/go.mod h1:t/M4DUcs7qyebtzm3nkyZ1zUB/svWnKtR+uRU2Ca8tQ=
+github.com/buildkite/go-buildkite/v5 v5.0.0/go.mod h1:wsKNPQmX0vAAR+RcGLyDJkSTsHXrHpnwSURaMckM7Wg=
 github.com/buildkite/termoji v0.0.0-20260330080310-c0aa4ebee0d1 h1:aaEl0QZURcwC+KOfFTzSp66xknw5eTmFZ1NgB87s2xk=
 github.com/buildkite/termoji v0.0.0-20260330080310-c0aa4ebee0d1/go.mod h1:ZTEvQlMN3+qzjROvjRb1p0X+xDQxxKpkMFhMSnaTrpw=
 github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=