Give this a try

Author: DerEchtePilz

.github/workflows/build.yml

@@ -40,7 +40,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v2
         with:
-          node-version: '20'
+          node-version: '22'
 
       - name: Install Docs Dependencies
         run: yarn install

reference-code/buildSrc/src/main/kotlin/common.gradle.kts

@@ -18,7 +18,7 @@ val junitVersion: String by project
 val mockBukkitVersion: String by project
 
 repositories {
-    mavenLocal()
+    //mavenLocal()
     maven {
         url = uri("https://libraries.minecraft.net")
     }
@@ -38,6 +38,7 @@ repositories {
     maven {
         url = uri("https://repo.maven.apache.org/maven2/")
     }
+    mavenCentral()
 }
 
 dependencies {

reference-code/spigot/build.gradle.kts

@@ -15,4 +15,5 @@ dependencies {
     implementation("org.spigotmc:spigot-api:$spigotVersion")
 
     testImplementation("dev.jorel:commandapi-spigot-test-toolkit:${commandApiVersion}")
+    testImplementation("io.papermc.paper:paper-api:1.21.4-R0.1-SNAPSHOT")
 }