flatten to produce explicit version numbers that are expected by central for publishing

Author: HighKo

kotlin-insight-client/pom.xml

@@ -91,7 +91,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>flatten-maven-plugin</artifactId>
-                <version>1.7.1</version>
+                <version>${maven.flatten.version}</version>
                 <executions>
                     <execution>
                         <goals>

kotlin-jira-client/pom.xml

@@ -93,7 +93,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>flatten-maven-plugin</artifactId>
-                <version>1.7.1</version>
+                <version>${maven.flatten.version}</version>
                 <executions>
                     <execution>
                         <goals>

pom.xml

@@ -26,6 +26,7 @@
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
         <maven.resources.plugin.version>3.3.1</maven.resources.plugin.version>
+        <maven.flatten.version>1.7.1</maven.flatten.version>
         <kotlin.compiler.jvmTarget>17</kotlin.compiler.jvmTarget>
         <kotlin.code.style>official</kotlin.code.style>
         <kotlin.version>2.0.20</kotlin.version>