chore: Update the key ASCIIDOCTOR_PDF_VERSION in the README.adoc file

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Author: asciidoctor-updateclibot[bot]

README.adoc

@@ -1,7 +1,7 @@
 :ALPINE_VERSION: 3.22.2
 :ASCIIDOCTOR_VERSION: 2.0.26
 :ASCIIDOCTOR_CONFLUENCE_VERSION: 0.0.2
-:ASCIIDOCTOR_PDF_VERSION: 2.3.22
+:ASCIIDOCTOR_PDF_VERSION: 2.3.23
 :ASCIIDOCTOR_DIAGRAM_VERSION: 3.0.1
 :ASCIIDOCTOR_EPUB3_VERSION: 2.3.0
 :ASCIIDOCTOR_FB2_VERSION: 0.8.0