chore(deps): bump squidfunk/mkdocs-material in /docs

Bumps squidfunk/mkdocs-material from `209b62d` to `86d21da`.

---
updated-dependencies:
- dependency-name: squidfunk/mkdocs-material
  dependency-version: 86d21da4f45f16e30774bf911e5b4795da13ce0cd197dbf8d3d059f256b2cc37
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/Dockerfile

@@ -1,5 +1,5 @@
 # version 9.5.35
-FROM squidfunk/mkdocs-material@sha256:209b62dd9530163cc5cf9a49853b5bb8570ffb3f3b5fe4eadc1d319bbda5ce2f
+FROM squidfunk/mkdocs-material@sha256:86d21da4f45f16e30774bf911e5b4795da13ce0cd197dbf8d3d059f256b2cc37
 
 # Install Node.js
 RUN apk add --no-cache nodejs=22.13.1-r0 npm