chore: Update snapshot.yml (#3661)

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dev-tools/integration/.env

@@ -1,6 +1,6 @@
 # If you use change this version without a pinned one, please update
 # .ci/bump-elastic-stack-snapshot.yml or .github/workflows/bump-golang.yml
-ELASTICSEARCH_VERSION=8.15.0-93475c89-SNAPSHOT
+ELASTICSEARCH_VERSION=8.15.0-021a3fba-SNAPSHOT
 ELASTICSEARCH_USERNAME=elastic
 ELASTICSEARCH_PASSWORD=changeme
 TEST_ELASTICSEARCH_HOSTS=localhost:9200