Update dependency io.papermc.paper:paper-api to v26 (#486)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -11,7 +11,7 @@ pluginyml = "0.6.0"
 publish = "0.37.0"
 minotaur = "2.9.0"
 runPaper = "3.0.2"
-paperApi = "1.21.4-R0.1-SNAPSHOT"
+paperApi = "26.2.build.100-stable"
 
 [libraries]