Bump @11ty/eleventy from 3.1.2 to 3.1.5 (#171)

Bumps [@11ty/eleventy](https://github.com/11ty/eleventy) from 3.1.2 to 3.1.5.
- [Release notes](https://github.com/11ty/eleventy/releases)
- [Changelog](https://github.com/11ty/eleventy/blob/main/docs/release-instructions.md)
- [Commits](11ty/eleventy@v3.1.2...v3.1.5)

---
updated-dependencies:
- dependency-name: "@11ty/eleventy"
  dependency-version: 3.1.5
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]