chore: Update the value of ARG asciidoctor_fb2_version in the Dockerfile

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Author: asciidoctor-updateclibot[bot]

Dockerfile

@@ -94,7 +94,7 @@ RUN apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing \
 ARG asciidoctor_confluence_version=0.0.2
 ARG asciidoctor_diagram_version=2.3.2
 ARG asciidoctor_epub3_version=2.1.3
-ARG asciidoctor_fb2_version=0.7.0
+ARG asciidoctor_fb2_version=0.8.0
 ARG asciidoctor_mathematical_version=0.3.5
 ARG asciidoctor_revealjs_version=5.2.0
 ARG kramdown_asciidoc_version=2.1.0