NIFI-9071 - Update asciidoctor plugin

This closes #5373

Signed-off-by: Mike Thomsen <mthomsen@apache.org>
diff --git a/nifi-docs/pom.xml b/nifi-docs/pom.xml
index 5f83b54..1aa7c70 100644
--- a/nifi-docs/pom.xml
+++ b/nifi-docs/pom.xml
@@ -48,7 +48,7 @@
             <plugin>
                 <groupId>org.asciidoctor</groupId>
                 <artifactId>asciidoctor-maven-plugin</artifactId>
-                <version>1.5.2</version>
+                <version>1.5.8</version>
                 <executions>
                     <execution>
                         <id>output-html</id>
diff --git a/nifi-registry/nifi-registry-core/nifi-registry-docs/pom.xml b/nifi-registry/nifi-registry-core/nifi-registry-docs/pom.xml
index 5748937..468b643 100644
--- a/nifi-registry/nifi-registry-core/nifi-registry-docs/pom.xml
+++ b/nifi-registry/nifi-registry-core/nifi-registry-docs/pom.xml
@@ -58,7 +58,7 @@
             <plugin>
                 <groupId>org.asciidoctor</groupId>
                 <artifactId>asciidoctor-maven-plugin</artifactId>
-                <version>1.5.2</version>
+                <version>1.5.8</version>
                 <executions>
                     <execution>
                         <id>output-html</id>
diff --git a/nifi-registry/nifi-registry-core/nifi-registry-web-api/pom.xml b/nifi-registry/nifi-registry-core/nifi-registry-web-api/pom.xml
index c62d0f9..584896c 100644
--- a/nifi-registry/nifi-registry-core/nifi-registry-web-api/pom.xml
+++ b/nifi-registry/nifi-registry-core/nifi-registry-web-api/pom.xml
@@ -215,7 +215,7 @@
             <plugin>
                 <groupId>org.asciidoctor</groupId>
                 <artifactId>asciidoctor-maven-plugin</artifactId>
-                <version>1.5.7.1</version>
+                <version>1.5.8</version>
                 <configuration>
                     <sourceDirectory>${asciidoc.source.dir}</sourceDirectory>
                     <sourceDocumentName>rest-api.adoc</sourceDocumentName>