Update buildkite plugin docker to v5.12.0 (#4)

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

.buildkite/pipeline.yaml

@@ -9,7 +9,7 @@ steps:
       - label: ":golangci-lint: lint :lint-roller:"
         key: "lint"
         plugins:
-          - docker#v5.11.0:
+          - docker#v5.12.0:
               image: "registry.hub.docker.com/golangci/golangci-lint:latest-alpine"
               command: ["golangci-lint", "run", "-v"]
               always-pull: true
@@ -18,7 +18,7 @@ steps:
       - label: ":golang: go test"
         key: "go_test"
         plugins:
-          - docker#v5.11.0:
+          - docker#v5.12.0:
               image: golang:1.23.0
               command: ["go", "test", "-coverprofile=coverage.out", "./..."]
         artifact_paths: ["coverage.out"]
@@ -29,7 +29,7 @@ steps:
       - label: ":closed_lock_with_key: gosec"
         key: "gosec"
         plugins:
-          - docker#v5.11.0:
+          - docker#v5.12.0:
               image: "registry.hub.docker.com/securego/gosec:2.20.0"
               command: ["-no-fail", "-exclude-generated", "-fmt sonarqube", "-out", "results.txt", "./..."]
               environment:
@@ -45,7 +45,7 @@ steps:
           - artifacts#v1.9.4:
               download: "coverage.out"
               step: "go_test"
-          - docker#v5.11.0:
+          - docker#v5.12.0:
               image: "sonarsource/sonar-scanner-cli:5"
               environment:
                 - "SONAR_TOKEN"
@@ -61,7 +61,7 @@ steps:
           - artifacts#v1.9.4:
               download: coverage.out
               step: "go_test"
-          - docker#v5.11.0:
+          - docker#v5.12.0:
               image: "sonarsource/sonar-scanner-cli:5"
               environment:
                 - "SONAR_TOKEN"