Update cosmos-api to version 1.21.8 and adjust repository URL in settings.gradle.kts.

api/build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 
 dependencies {
     // Cosmos
-    compileOnly("com.alttd.cosmos:cosmos-api:1.21.7-R0.1-SNAPSHOT") {
+    compileOnly("com.alttd.cosmos:cosmos-api:1.21.8-R0.1-SNAPSHOT") {
         isChanging = true
     }
     compileOnly("org.spongepowered:configurate-yaml:4.2.0") // Configurate