Bump actions/checkout from 2.3.5 to 2.4.0 apache#78

Author: garydgregory

src/changes/changes.xml

@@ -90,7 +90,7 @@
        Bump maven-pmd-plugin from 3.12.0 to 3.15.0, #44, #54, #67.
      </action>
      <action type="update" dev="ggregory" due-to="Dependabot">
-       Bump actions/checkout from v2.3.1 to v2.3.5 #46, #72.
+       Bump actions/checkout from v2.3.1 to v2.4.0 #46, #72, #78.
      </action>
      <action type="update" dev="ggregory" due-to="Dependabot, Gary Gregory">
        Bump actions/setup-java from v1.4.2 to v2 #50.