Bump org.asciidoctor.jvm.convert from 4.0.1 to 4.0.3

Bumps org.asciidoctor.jvm.convert from 4.0.1 to 4.0.3.

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

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

build.gradle

@@ -5,7 +5,7 @@ buildscript {
 }
 
 plugins {
-    id 'org.asciidoctor.jvm.convert'    version '4.0.1'
+    id 'org.asciidoctor.jvm.convert'    version '4.0.3'
     id 'org.ajoberstar.git-publish'     version '4.2.2'
 }