Fix missing version number in manifest

buildSrc/src/main/groovy/ferritecore.loader-conventions.gradle

@@ -9,9 +9,9 @@ jar {
         attributes([
             'Specification-Title'     : mod_name,
             'Specification-Vendor'    : mod_author,
-            'Specification-Version'   : project.jar.archiveVersion,
+            'Specification-Version'   : mod_version,
             'Implementation-Title'    : project.name,
-            'Implementation-Version'  : project.jar.archiveVersion,
+            'Implementation-Version'  : mod_version,
             'Implementation-Vendor'   : mod_author,
             'Implementation-Timestamp': new Date().format("yyyy-MM-dd'T'HH:mm:ssZ"),
             'Timestampe'              : System.currentTimeMillis(),