fix(abg): use correct coordinates in generated maven metadata file

Author: Vampire

maven-binding-builder/src/main/kotlin/io/github/typesafegithub/workflows/mavenbinding/MavenMetadataBuilding.kt

@@ -18,7 +18,7 @@ internal suspend fun ActionCoords.buildMavenMetadataFile(githubToken: String): S
         <?xml version="1.0" encoding="UTF-8"?>
         <metadata>
           <groupId>$owner</groupId>
-          <artifactId>$fullName</artifactId>
+          <artifactId>$mavenName</artifactId>
           <versioning>
             <latest>$newest</latest>
             <release>$newest</release>