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.github/workflows/matplotlib-tests.yml:31: update your workflow using https://app.stepsecurity.io/secureworkflow/optuna/optuna/matplotlib-tests.yml/master?enable=pin","Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/pypi-publish.yml:23: update your workflow using https://app.stepsecurity.io/secureworkflow/optuna/optuna/pypi-publish.yml/master?enable=pin","Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/pypi-publish.yml:25: update your workflow using https://app.stepsecurity.io/secureworkflow/optuna/optuna/pypi-publish.yml/master?enable=pin","Warn: third-party GitHubAction not pinned by hash: .github/workflows/pypi-publish.yml:56: update your workflow using https://app.stepsecurity.io/secureworkflow/optuna/optuna/pypi-publish.yml/master?enable=pin","Warn: third-party GitHubAction not pinned by hash: .github/workflows/pypi-publish.yml:68: update your workflow using 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.github/workflows/speed-benchmarks.yml:20: update your workflow using https://app.stepsecurity.io/secureworkflow/optuna/optuna/speed-benchmarks.yml/master?enable=pin","Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/speed-benchmarks.yml:25: update your workflow using https://app.stepsecurity.io/secureworkflow/optuna/optuna/speed-benchmarks.yml/master?enable=pin","Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/sphinx-build.yml:21: update your workflow using https://app.stepsecurity.io/secureworkflow/optuna/optuna/sphinx-build.yml/master?enable=pin","Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/sphinx-build.yml:23: update your workflow using https://app.stepsecurity.io/secureworkflow/optuna/optuna/sphinx-build.yml/master?enable=pin","Warn: GitHub-owned GitHubAction not pinned by hash: .github/workflows/sphinx-build.yml:30: update your workflow using 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.github/workflows/windows-tests.yml:35: update your workflow using https://app.stepsecurity.io/secureworkflow/optuna/optuna/windows-tests.yml/master?enable=pin","Warn: containerImage not pinned by hash: Dockerfile:3","Warn: pipCommand not pinned by hash: Dockerfile:7-11","Warn: pipCommand not pinned by hash: Dockerfile:7-11","Warn: pipCommand not pinned by hash: Dockerfile:18-23","Warn: pipCommand not pinned by hash: Dockerfile:18-23","Warn: pipCommand not pinned by hash: Dockerfile:18-23","Warn: pipCommand not pinned by hash: Dockerfile:26","Warn: pipCommand not pinned by hash: formats.sh:32","Warn: pipCommand not pinned by hash: .github/workflows/checks-optional.yaml:22","Warn: pipCommand not pinned by hash: .github/workflows/checks-optional.yaml:23","Warn: pipCommand not pinned by hash: .github/workflows/checks-optional.yaml:30","Warn: pipCommand not pinned by hash: .github/workflows/checks.yml:30","Warn: pipCommand not pinned by hash: .github/workflows/checks.yml:31","Warn: 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