Revert "Bump org.codehaus.mojo:exec-maven-plugin from 1.6.0 to 3.6.1 (#2314)"

This reverts commit 17a3822.

Author: OlgaMaciaszek

pom.xml

@@ -64,7 +64,7 @@
 		<xpath2.processor.version>2.1.100</xpath2.processor.version>
 		<xerces.version>2.12.2</xerces.version>
 		<jacoco-maven-plugin.version>0.8.13</jacoco-maven-plugin.version>
-		<exec-maven-plugin.version>3.6.1</exec-maven-plugin.version>
+		<exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
 		<flatten-maven-plugin.version>1.5.0</flatten-maven-plugin.version>
 
 		<contract.kotlin.version>2.1.10</contract.kotlin.version>