chore(deps-dev): bump @rknightuk/eleventy-plugin-post-graph

Bumps [@rknightuk/eleventy-plugin-post-graph](https://github.com/rknightuk/eleventy-plugin-post-graph) from 1.0.5 to 1.0.6.
- [Changelog](https://github.com/rknightuk/eleventy-plugin-post-graph/blob/main/changelog.md)
- [Commits](https://github.com/rknightuk/eleventy-plugin-post-graph/commits)

---
updated-dependencies:
- dependency-name: "@rknightuk/eleventy-plugin-post-graph"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -23,7 +23,7 @@
     "@11ty/eleventy-img": "^3.1.8",
     "@11ty/eleventy-plugin-rss": "^1.2.0",
     "@11ty/eleventy-plugin-syntaxhighlight": "^5.0.0",
-    "@rknightuk/eleventy-plugin-post-graph": "^1.0.5",
+    "@rknightuk/eleventy-plugin-post-graph": "^1.0.6",
     "autoprefixer": "^10.4.16",
     "child_process": "^1.0.2",
     "clean-css": "^5.3.3",