[OAS][Docs] Use correct bump dependency in makefile (elastic#199876)

Updates the Open API docs make targets to use the correct bump.sh
dependency.

Unless I'm missing something obvious in my local configuration, `@npx
bump ...` uses [node-bump](https://www.npmjs.com/package/bump) not the
[bump.sh library](https://www.npmjs.com/package/bump-cli). I discovered
this while trying to run the make targets locally.

(cherry picked from commit fcc9392)

.buildkite/scripts/steps/checks/capture_oas_snapshot.sh

@@ -9,7 +9,7 @@ source .buildkite/scripts/common/util.sh
 .buildkite/scripts/copy_es_snapshot_cache.sh
 
 echo --- Capture OAS snapshot
-cmd="node scripts/capture_oas_snapshot --include-path /api/status --include-path /api/alerting/rule/ --include-path /api/alerting/rules --include-path /api/actions --include-path /api/security/role --include-path /api/spaces"
+cmd="node scripts/capture_oas_snapshot --include-path /api/status --include-path /api/alerting/rule/ --include-path /api/alerting/rules --include-path /api/actions --include-path /api/security/role --include-path /api/spaces --include-path /api/dashboards"
 if is_pr && ! is_auto_commit_disabled; then
   cmd="$cmd --update"
 fi