Bump com.gradleup.shadow from 8.3.8 to 9.1.0

Bumps [com.gradleup.shadow](https://github.com/GradleUp/shadow) from 8.3.8 to 9.1.0.
- [Release notes](https://github.com/GradleUp/shadow/releases)
- [Commits](GradleUp/shadow@8.3.8...9.1.0)

---
updated-dependencies:
- dependency-name: com.gradleup.shadow
  dependency-version: 9.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

build.gradle

@@ -1,7 +1,7 @@
 import org.opensearch.gradle.ConcatFilesTask
 
 plugins {
-    id 'com.gradleup.shadow' version "8.3.8" apply false
+    id 'com.gradleup.shadow' version "9.1.0" apply false
 }
 
 description = 'OpenSearch for Apache Hadoop'