Bump @11ty/eleventy-plugin-rss from 1.1.2 to 1.2.0

Bumps [@11ty/eleventy-plugin-rss](https://github.com/11ty/eleventy-plugin-rss) from 1.1.2 to 1.2.0.
- [Release notes](https://github.com/11ty/eleventy-plugin-rss/releases)
- [Commits](11ty/eleventy-plugin-rss@v1.1.2...v1.2.0)

---
updated-dependencies:
- dependency-name: "@11ty/eleventy-plugin-rss"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]