Bump org.apache.commons:commons-exec from 1.5.0 to 1.6.0 (#324)

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Author: dependabot[bot]

pom.xml

@@ -24,7 +24,7 @@
     <maven.compiler.target>1.8</maven.compiler.target>
     <org.apache.commons.io.version>2.21.0</org.apache.commons.io.version>
     <org.apache.commons.lang.version>3.20.0</org.apache.commons.lang.version>
-    <org.apache.commons.exec.version>1.5.0</org.apache.commons.exec.version>
+    <org.apache.commons.exec.version>1.6.0</org.apache.commons.exec.version>
     <jgit.version>5.13.1.202206130422-r</jgit.version>
     <jacoco.version>0.8.13</jacoco.version>
     <takari-plugin-testing.version>3.1.1</takari-plugin-testing.version>