Bump astro-mermaid from 1.2.0 to 1.3.1

Bumps [astro-mermaid](https://github.com/joesaby/astro-mermaid) from 1.2.0 to 1.3.1.
- [Release notes](https://github.com/joesaby/astro-mermaid/releases)
- [Commits](joesaby/astro-mermaid@v1.2.0...v1.3.1)

---
updated-dependencies:
- dependency-name: astro-mermaid
  dependency-version: 1.3.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

bun.lock

@@ -25,7 +25,7 @@
     "@astrojs/starlight": "^0.37.3",
     "@plausible-analytics/tracker": "^0.4.4",
     "astro": "^5.16.11",
-    "astro-mermaid": "^1.2.0",
+    "astro-mermaid": "^1.3.1",
     "starlight-theme-rapide": "^0.5.2"
   },
   "packageManager": "bun@1.3.6"