⬆️ Update @node-red-contrib-themes/theme-collection to v3.1.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@node-red-contrib-themes/theme-collection	3.1.8 -> 3.1.9

---

Release Notes

node-red-contrib-themes/theme-collection (@​node-red-contrib-themes/theme-collection)

### [`v3.1.9`](https://togithub.com/node-red-contrib-themes/theme-collection/releases/tag/3.1.9) [Compare Source](https://togithub.com/node-red-contrib-themes/theme-collection/compare/3.1.8...3.1.9) ### What’s changed #### 🐛 Bug fixes - Don't use opacity on borders ([#​362](https://togithub.com/node-red-contrib-themes/theme-collection/pull/362)) [@​bonanitech](https://togithub.com/bonanitech) #### ⬆️ Dependency updates

2 changes

- Update sass to v1.70.0 ([#​361](https://togithub.com/node-red-contrib-themes/theme-collection/pull/361)) [@​renovate](https://togithub.com/renovate) - Update nodemon to v3.0.3 ([#​360](https://togithub.com/node-red-contrib-themes/theme-collection/pull/360)) [@​renovate](https://togithub.com/renovate)

**Full Changelog**: https://github.com/node-red-contrib-themes/theme-collection/compare/3.1.8...3.1.9

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.