[Backport 2.x] Update tibdex/github-app-token action to v2

[opensearch-trigger-bot]

Backport 9655f07 from #31.

[codecov]

Codecov Report

Merging #36 (5309d2f) into 2.x (eae1c24) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##             2.x     #36   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          2       2           
  Lines          4       4           
=====================================
  Misses         4       4           

[joshpalis]

Checks are failing due to :

Could not determine the dependencies of task ':thirdPartyAudit'.
> Could not resolve all files for configuration ':runtimeClasspath'.
   > Could not find org.opensearch:opensearch-core:3.0.0-SNAPSHOT.
     Searched in the following locations:
       - https://repo.maven.apache.org/maven2/org/opensearch/opensearch-core/3.0.0-SNAPSHOT/maven-metadata.xml
       - https://repo.maven.apache.org/maven2/org/opensearch/opensearch-core/3.0.0-SNAPSHOT/opensearch-core-3.0.0-SNAPSHOT.pom
       - file:/Users/runner/.m2/repository/org/opensearch/opensearch-core/3.0.0-SNAPSHOT/maven-metadata.xml
       - file:/Users/runner/.m2/repository/org/opensearch/opensearch-core/3.0.0-SNAPSHOT/opensearch-core-3.0.0-SNAPSHOT.pom
       - https://aws.oss.sonatype.org/content/repositories/snapshots/org/opensearch/opensearch-core/3.0.0-SNAPSHOT/maven-metadata.xml
       - https://aws.oss.sonatype.org/content/repositories/snapshots/org/opensearch/opensearch-core/3.0.0-SNAPSHOT/opensearch-core-3.0.0-20230913.214138-1455.pom
       - https://plugins.gradle.org/m2/org/opensearch/opensearch-core/3.0.0-SNAPSHOT/maven-metadata.xml
       - https://plugins.gradle.org/m2/org/opensearch/opensearch-core/3.0.0-SNAPSHOT/opensearch-core-3.0.0-SNAPSHOT.pom
     Required by:
         project : > org.opensearch:opensearch:3.0.0-SNAPSHOT:20230913.[17](https://github.com/opensearch-project/opensearch-ai-flow-framework/actions/runs/6178146234/job/16770829949?pr=36#step:4:18)1334-1452
         project : > org.opensearch:opensearch:3.0.0-SNAPSHOT:[20](https://github.com/opensearch-project/opensearch-ai-flow-framework/actions/runs/6178146234/job/16770829949?pr=36#step:4:21)230913.171334-1452 > org.opensearch:opensearch-compress:3.0.0-SNAPSHOT:20230913.[21](https://github.com/opensearch-project/opensearch-ai-flow-framework/actions/runs/6178146234/job/16770829949?pr=36#step:4:22)4138-173
         project : > org.opensearch:opensearch:3.0.0-SNAPSHOT:20[23](https://github.com/opensearch-project/opensearch-ai-flow-framework/actions/runs/6178146234/job/16770829949?pr=36#step:4:24)0913.171334-1452 > org.opensearch:opensearch-x-content:3.0.0-SNAPSHOT:20230913.171334-1452

This is unrelated to the changes of this PR, @owaiskazi19 do you want to wait merging until this is resolved?