v3.0: Ignore security advisory from tracing-subscriber dep

[steviez]

Problem

Crate:     tracing-subscriber
Version:   0.3.7
Title:     Logging user input may result in poisoning logs with ANSI escape sequences
Date:      2025-08-29
ID:        RUSTSEC-2025-0055
URL:       https://rustsec.org/advisories/RUSTSEC-2025-0055
Solution:  Upgrade to >=0.3.20
Dependency tree:
tracing-subscriber 0.3.7

Summary of Changes

Ignore the advisory given the callers of this dependency are not production code:

cargo tree --invert tracing-subscriber --depth 3
tracing-subscriber v0.3.20
└── tracing-opentelemetry v0.17.2
    └── tarpc v0.29.0
        ├── solana-banks-client v3.1.0 (/Users/steviez/src/solana/banks-client)
        ├── solana-banks-interface v3.1.0 (/Users/steviez/src/solana/banks-interface)
        └── solana-banks-server v3.1.0 (/Users/steviez/src/solana/banks-server)

[mergify]

Backports to the stable branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule.