Bump asciidoctor-maven-plugin to 2.2.5

getting rid of JRuby dependency workaround for
https://github.com/asciidoctor/asciidoctor-maven-plugin/issues/553

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

pom.xml

@@ -425,7 +425,7 @@
 				<plugin>
 					<groupId>org.asciidoctor</groupId>
 					<artifactId>asciidoctor-maven-plugin</artifactId>
-					<version>2.2.4</version>
+					<version>2.2.5</version>
 					<configuration>
 						<attributes>
 							<source-highlighter>coderay</source-highlighter>
@@ -449,12 +449,6 @@
 							<artifactId>asciidoctorj-pdf</artifactId>
 							<version>2.3.10</version>
 						</dependency>
-						<!-- TODO: Remove dependency after https://github.com/asciidoctor/asciidoctor-maven-plugin/issues/553 fix -->
-						<dependency>
-							<groupId>org.jruby</groupId>
-							<artifactId>jruby</artifactId>
-							<version>9.4.5.0</version>
-						</dependency>
 					</dependencies>
 				</plugin>
 			</plugins>