Dependabot
base branch的なもの https://docs.github.com/ja/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#target-branch
base branch的なもの https://docs.github.com/ja/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#target-branch