Bump org.asciidoctor.jvm.convert from 3.3.2 to 4.0.3

Bumps org.asciidoctor.jvm.convert from 3.3.2 to 4.0.3.

---
updated-dependencies:
- dependency-name: org.asciidoctor.jvm.convert
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/build.gradle

@@ -4,7 +4,7 @@ import static java.nio.charset.StandardCharsets.UTF_8
 
 plugins {
     id 'archunit.base-conventions'
-    id "org.asciidoctor.jvm.convert" version "3.3.2"
+    id "org.asciidoctor.jvm.convert" version "4.0.3"
 }
 
 task cleanUserGuide(type: Delete) {