chore(deps): update valkey/valkey docker tag to v9.0.3

[renovate]

This PR contains the following updates:

Package	Update	Change
valkey/valkey	patch	9.0.2 → 9.0.3

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Release Notes

valkey-io/valkey (valkey/valkey)

v9.0.3

Compare Source

Valkey 9.0.3

Upgrade urgency SECURITY: This release includes security fixes we recommend you
apply as soon as possible.

Security fixes

• (CVE-2025-67733) RESP Protocol Injection via Lua error_reply
• (CVE-2026-21863) Remote DoS with malformed Valkey Cluster bus message
• (CVE-2026-27623) Reset request type after handling empty requests

Bug fixes

• Avoids crash during MODULE UNLOAD when ACL rules reference a module command and subcommand (#​3160)
• Fix server assert on ACL LOAD when current user loses permission to channels (#​3182)
• Fix bug causing no response flush sometimes when IO threads are busy (#​3205)

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