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

Author: renovate[bot]

gradle/libs.versions.toml

@@ -11,7 +11,7 @@ pluginyml = "0.6.0"
 publish = "0.36.0"
 minotaur = "2.9.0"
 runPaper = "3.0.2"
-paperApi = "1.21.4-R0.1-SNAPSHOT"
+paperApi = "26.1.2.build.66-stable"
 
 [libraries]