add Mekanism runtime dep (not working)

build.gradle

@@ -11,6 +11,7 @@ group = mod_group_id
 
 repositories {
  mavenLocal()
+ maven { url 'https://modmaven.dev/' }
 }
 
 base {
@@ -84,6 +85,8 @@ dependencies {
  // For all intends and purposes: You can treat this dependency as if it is a normal library you would use.
  implementation "net.neoforged:neoforge:${neo_version}"
 
+ runtimeOnly "mekanism:Mekanism:1.20.4-10.5.8.30"
+
  // Example mod dependency with JEI
  // The JEI API is declared for compile time use, while the full JEI artifact is used at runtime
  // compileOnly "mezz.jei:jei-${mc_version}-common-api:${jei_version}"