chore: Update the value of ARG asciidoctor_pdf_version in the Dockerfile

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Author: asciidoctor-updateclibot[bot]

Dockerfile

@@ -14,7 +14,7 @@ LABEL maintainers="Guillaume Scheibel <[email protected]>, Damien DUP
 LABEL org.opencontainers.image.source="https://github.com/asciidoctor/docker-asciidoctor"
 
 ARG asciidoctor_version=2.0.26
-ARG asciidoctor_pdf_version=2.3.22
+ARG asciidoctor_pdf_version=2.3.23
 
 ENV ASCIIDOCTOR_VERSION=${asciidoctor_version} \
   ASCIIDOCTOR_PDF_VERSION=${asciidoctor_pdf_version}