chore(deps): update actions/checkout action to v6 (maintenance/mps20251)#1668

sergej-koscejev merged 1 commit intomaintenance/mps20251JetBrains/MPS-extensions:maintenance/mps20251from

renovate/maintenance/mps20251-actions-checkout-6.xJetBrains/MPS-extensions:renovate/maintenance/mps20251-actions-checkout-6.xCopy head branch name to clipboard