chore(deps): bump io.papermc.paper:paper-api

Bumps io.papermc.paper:paper-api from 26.1.2.build.+ to 26.2.build.87-stable.

---
updated-dependencies:
- dependency-name: io.papermc.paper:paper-api
  dependency-version: 26.2.build.87-stable
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -9,7 +9,7 @@ jetbrains-annotations = "26.0.2"
 # inventory-framework-platform-paper also requires a Java 25 toolchain, since Paper's own published
 # artifacts for this version declare that requirement (see its build.gradle.kts).
 spigot = "26.1-R0.1-SNAPSHOT"
-paperSpigot = "26.1.2.build.+"
+paperSpigot = "26.2.build.87.+"
 junit = "6.0.0"
 mockito = "4.11.0"
 adventure-api = "4.25.0"