Bump org.jetbrains.intellij.platform from 2.12.0 to 2.13.1

Bumps org.jetbrains.intellij.platform from 2.12.0 to 2.13.1.

---
updated-dependencies:
- dependency-name: org.jetbrains.intellij.platform
  dependency-version: 2.13.1
  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

@@ -7,7 +7,7 @@ flexmark = "0.64.8"
 # plugins
 kotlin = "2.2.20"
 changelog = "2.5.0"
-gradleIntelliJPluginVersion = "2.12.0"
+gradleIntelliJPluginVersion = "2.13.1"
 
 [libraries]
 annotations = { group = "org.jetbrains", name = "annotations", version.ref = "annotations" }