fix(deps): update tracing-subscriber to 0.3.20 (low CVE-2025-58160)

[github-actions]

Description

Bumps tracing-subscriber to resolve a low severity vulnerability.

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Security Alert

• Alert: https://github.com/okx/xlayer-reth/security/dependabot/3
• CVE / ID: CVE-2025-58160
• Severity: low
• Vulnerable range: < 0.3.20
• Fixed in: 0.3.20

Change

Raised the minimum version floor for tracing-subscriber in crates/builder/Cargo.toml from 0.3.18 to 0.3.20. The lock file already resolved to 0.3.22 so this is a no-op at build time, but it encodes the safe minimum and prevents any future cargo update from selecting a version below the patched threshold.

Note: a second instance of tracing-subscriber 0.2.25 exists in the lock file as a transitive dependency of ark-relations 0.5.1 (which requires ^0.2). That instance cannot be updated to the 0.3.x line without an upstream change to ark-relations and is outside the scope of this PR.

Checklist

• I have reviewed the relevant code guidelines in the docs/ folder
• My code follows the coding standards of this project
• I have performed a self-review of my own code