chore(deps): update rust crate casbin to v2.19.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
casbin (source)	workspace.dependencies	minor	2.17.0 -> 2.19.0

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Release Notes

casbin/casbin-rs (casbin)

v2.19.0

Compare Source

Features

• disable semantic-release git commits to remove bump version commits (#​413) (97851d2)

v2.18.1

Compare Source

Bug Fixes

• remove "Deploy Docs to GitHub Pages" CI script and gh-pages branch (#​411) (aeb7fe0)

v2.18.0

Compare Source

Bug Fixes

• remove beta Rust version from CI (#​409) (f22f84c)
• remove irrelevant links in README (7272c2a)

Features

• fix FileAdapter CSV format to preserve spaces after commas (#​407) (5d0a915)

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[claude]

PR Review: Casbin Dependency Update (2.17.0 → 2.19.0)

Summary

This PR updates the casbin crate from version 2.17.0 to 2.19.0. The update includes two minor version increments with no breaking changes.

Changes in casbin 2.17.0 → 2.19.0

v2.19.0:

• Disabled semantic-release git commits to remove bump version commits

v2.18.1:

• Removed "Deploy Docs to GitHub Pages" CI script and gh-pages branch

v2.18.0:

• Fix: FileAdapter CSV format now preserves spaces after commas (#407)
• Removed beta Rust version from CI
• Documentation link cleanup

Impact Analysis

✅ Low Risk Update - This is a safe dependency update for the following reasons:

1. No Breaking Changes: Both v2.18.0 and v2.19.0 are minor releases with no breaking API changes

2. FileAdapter Change Does Not Apply: The main functional change in v2.18.0 fixes CSV format handling in FileAdapter, but Scotty uses MemoryAdapter (see scotty/src/services/authorization/service.rs:36), so this change has zero impact on the codebase

3. Custom Functions Compatible: Scotty's custom user_match function for domain/wildcard matching (used for authorization) does not rely on any APIs affected by these updates

4. Runtime Features Unchanged: The dependency is configured with runtime-tokio and cached features, which remain stable across these versions

Recommendations

✅ Approve and Merge - This is a straightforward dependency maintenance update with:

• No breaking changes
• No impact on Scotty's casbin usage patterns
• Standard housekeeping improvements in the upstream library

Testing Suggestions

While the risk is low, consider running the authorization test suite to verify compatibility:

cargo test authorization

The existing tests in scotty/tests/authorization_domain_test.rs and unit tests in scotty/src/services/authorization/casbin.rs should provide adequate coverage to catch any unexpected issues.

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Verdict: ✅ Safe to merge after CI passes