Fix incorrect inherited URLs in pom.xml (#2351)

Previously Maven appended the artifact ID of the modules which lead for
example for the `gson` module to the incorrect URL https://github.com/google/gson/gson

This can be checked with `mvn help:effective-pom`

pom.xml

@@ -14,7 +14,8 @@
   See the License for the specific language governing permissions and
   limitations under the License.
 -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"
+    child.project.url.inherit.append.path="false">
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>com.google.code.gson</groupId>
@@ -39,7 +40,9 @@
     <maven.compiler.testRelease>11</maven.compiler.testRelease>
   </properties>
 
-  <scm>
+  <!-- These attributes specify that the URLs should be inherited by the modules as is, to avoid constructing
+    invalid URLs, see also https://maven.apache.org/ref/3.9.1/maven-model-builder/index.html#inheritance-assembly -->
+  <scm child.scm.url.inherit.append.path="false" child.scm.connection.inherit.append.path="false" child.scm.developerConnection.inherit.append.path="false">
     <url>https://github.com/google/gson/</url>
     <connection>scm:git:https://github.com/google/gson.git</connection>
     <developerConnection>scm:git:git@github.com:google/gson.git</developerConnection>