Update docker.tyk.io/tyk-gateway/tyk-gateway Docker tag to v5.11.0

This MR contains the following updates:

Package	Type	Update	Change
docker.tyk.io/tyk-gateway/tyk-gateway	ironbank-docker	minor	v5.10.0 → v5.11.0
docker.tyk.io/tyk-gateway/tyk-gateway	stage	minor	v5.10.0 → v5.11.0

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