chore: use outlet graceful drain support

[pjb157]

Summary

• pin Outlet to the graceful-drain implementation from feat: add graceful request logger drain outlet#99
• keep PostgresHandler on the same RequestHandler trait instance as downstream consumers

Dependency

• Requires feat: add graceful request logger drain outlet#99

Verification

• cargo fmt --check
• cargo clippy --all-targets --all-features -- -D warnings
• cargo test (33 unit/integration tests and 5 doc tests passed)

[Copilot]

Pull request overview

Pins this crate’s outlet dependency to a specific upstream commit that includes graceful-drain support, aligning the RequestHandler trait source with downstream consumers that are also using that pinned upstream revision.

Changes:

• Switch outlet from the crates.io 0.9 release to a git dependency pinned by rev (commit 6206a0b…).
• Update Cargo.lock to reflect outlet being sourced from the pinned git commit instead of crates.io.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
Cargo.toml	Pins outlet to a specific upstream commit to pick up graceful-drain support.
Cargo.lock	Updates lockfile to reflect the git-sourced outlet dependency.

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