Revert "Bump org.apache.mina:mina-core from 2.1.8 to 2.1.9"

This reverts commit aa20639.

Author: garydgregory

pom.xml

@@ -512,7 +512,7 @@
       <dependency>
         <groupId>org.apache.mina</groupId>
         <artifactId>mina-core</artifactId>
-        <version>2.1.9</version>
+        <version>2.1.8</version>
       </dependency>
       <dependency>
         <groupId>org.bouncycastle</groupId>

src/changes/changes.xml

@@ -391,9 +391,6 @@ The <action> type attribute can be add,update,fix,remove.
       <action dev="ggregory" type="update" due-to="Gary Gregory">
         Bump ant:ant 1.6.5 to org.apache.ant:ant 1.10.14.
       </action>
-      <action dev="ggregory" type="update" due-to="Gary Gregory">
-        Bump org.apache.mina:mina-core from 2.1.8 to 2.1.9.
-      </action>
     </release>
     <release version="2.9.0" date="2021-06-16" description="Maintenance release. Requires Java 8 or above.">
       <!-- ADDS -->