fix(github-action): update image ghcr.io/bjw-s/mdbook to v0.4.42 (#4641)

| datasource | package              | from   | to     |
| ---------- | -------------------- | ------ | ------ |
| docker     | ghcr.io/bjw-s/mdbook | 0.4.41 | 0.4.42 |

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/publish-docs.yaml

@@ -28,7 +28,7 @@ jobs:
           token: "${{ steps.generate-token.outputs.token }}"
 
       - name: Build docs
-        uses: docker://ghcr.io/bjw-s/mdbook:0.4.41@sha256:e2e5c03848a1a70cf9379d57f059d05d6addb7ca5628d70d1d1477e6f5e72f7e
+        uses: docker://ghcr.io/bjw-s/mdbook:0.4.42@sha256:c55777ed3899a12d2fb7e4c39ab0f43a0a2535498a3d7e8b8d285dda5a172538
         with:
           args: mdbook build docs