Update gcr.io/cloud-sql-connectors/cloud-sql-proxy Docker tag to v2.21.3 - abandoned

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This PR contains the following updates:

Package	Update	Change
gcr.io/cloud-sql-connectors/cloud-sql-proxy	patch	2.21.2 → 2.21.3

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Release Notes

GoogleCloudPlatform/cloud-sql-proxy (gcr.io/cloud-sql-connectors/cloud-sql-proxy)

v2.21.3

Compare Source

Bug Fixes

• examples: change admin port on prestop of proxy_with_http_health_check (#​2576) (51d1583)
• use specific config file for loading (#​2573) (#​2580) (f951767)

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