chore(deps): update pandoc/core docker tag to v3.8.2.1

Author: renovate[bot]

.github/workflows/pages.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
-      - uses: docker://pandoc/core:3.1.1.0
+      - uses: docker://pandoc/core:3.8.2.1@sha256:6c1440145aaa075bd9cee256343bb108d95dfe77cfaafa6475c88d1efd62c580
         with:
           args: >-
             --standalone --template=template.html --output=index.html README.md