chore(deps): update pandoc/core docker digest to df66813

[skip pre-commit.ci]

Author: renovate[bot]

.github/workflows/gh-pages.yml

@@ -51,7 +51,7 @@ jobs:
         run: asciidoctor -b docbook README.adoc
 
       - name: Generate README.md from README.xml using pandoc
-        uses: docker://pandoc/core@sha256:2b79262284929afdbe98b73097bfc6ed0e1fb5b0ea59db984890e6b84d5fe17a
+        uses: docker://pandoc/core@sha256:df668139a3580c59f1ad1547501ffa0c4d040ccbc1a8c233a48d51c3555f1aad
         with:
           args: "-f docbook -t markdown_strict README.xml -o README.md --wrap=none"