dependency: Update dependency io.papermc.paper:paper-api to v26

Author: renovate[bot]

buildSrc/src/main/kotlin/Versions.kt

@@ -1,6 +1,6 @@
 object Versions {
 
-    const val PAPER_API = "1.20.4-R0.1-SNAPSHOT"
+    const val PAPER_API = "26.1.2.build.61-stable"
 
     const val OKAERI_CONFIGS = "5.0.13"
     const val LITE_COMMANDS = "3.10.9"