Add GH vault plugin bot to allowed list (#5069)

Author: ev1yehor

.buildkite/pull-requests.json

@@ -5,7 +5,7 @@
             "pipelineSlug": "elastic-agent",
             "allow_org_users": true,
             "allowed_repo_permissions": ["admin", "write"],
-            "allowed_list": ["dependabot[bot]", "mergify[bot]", "github-actions[bot]"],
+            "allowed_list": ["dependabot[bot]", "mergify[bot]", "github-actions[bot]", "elastic-vault-github-plugin-prod[bot]"],
             "set_commit_status": true,
             "build_on_commit": true,
             "build_on_comment": true,
@@ -21,7 +21,7 @@
             "pipelineSlug": "elastic-agent-package",
             "allow_org_users": true,
             "allowed_repo_permissions": ["admin", "write"],
-            "allowed_list": ["dependabot[bot]", "mergify[bot]"],
+            "allowed_list": ["dependabot[bot]", "mergify[bot]", "elastic-vault-github-plugin-prod[bot]"],
             "set_commit_status": false,
             "build_on_commit": false,
             "build_on_comment": true,
@@ -37,7 +37,7 @@
             "pipelineSlug": "elastic-agent-binary-dra",
             "allow_org_users": true,
             "allowed_repo_permissions": ["admin", "write"],
-            "allowed_list": ["dependabot[bot]", "mergify[bot]"],
+            "allowed_list": ["dependabot[bot]", "mergify[bot]", "elastic-vault-github-plugin-prod[bot]"],
             "set_commit_status": false,
             "build_on_commit": false,
             "build_on_comment": true,