chore(deps): update ghcr.io/buildkite/buildkite-mcp-server docker tag to v0.5.9 (#11)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

registry/buildkite/spec.yaml

@@ -5,7 +5,7 @@
 # Import timestamp: 2025-08-11T09:21:39Z
 # ---
 name: buildkite
-image: ghcr.io/buildkite/buildkite-mcp-server:0.5.8
+image: ghcr.io/buildkite/buildkite-mcp-server:0.5.9
 description: Connect your Buildkite data (pipelines, builds, jobs, tests) to AI tooling and editors.
 tier: Official
 status: Active