docker(deps): bump rust from 6cff8a3 to 991b176 in /docker/fdb-integration-tests (#37)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docker/fdb-integration-tests/Dockerfile

@@ -2,7 +2,7 @@
 # This container runs InferaDB Management API tests against a real FDB instance
 # For integration testing only - not for production use
 
-FROM rust:1.92-slim@sha256:6cff8a33b03d328aa58d00dedda6a3c5bbee4b41e21533932bffd90d7d58f9c4
+FROM rust:1.92-slim@sha256:991b1768c575086cbf188eb03e78003ec4e31947029b1947e8034ae32aa6156b
 
 # Set environment variables for non-interactive installation
 ENV DEBIAN_FRONTEND=noninteractive