Bump actions/checkout from v2.3.3 to v2.3.4 #168.

Author: Gary Gregory

src/changes/changes.xml

@@ -104,7 +104,7 @@ The <action> type attribute can be add,update,fix,remove.
         Update org.junit-pioneer:junit-pioneer 0.9.0 -> 1.0.0 #159, #162.
       </action>
       <action dev="ggregory" type="update" due-to="Dependabot">
-        Update actions/checkout from v2.3.2 to v2.3.3 #156.
+        Update actions/checkout from v2.3.2 to v2.3.4, #156, #168.
       </action>
       <action dev="ggregory" type="update" due-to="Dependabot">
         Bump actions/setup-java from v1.4.2 to v1.4.3 #160.