v0.3.6

Update proxer-cli to version 0.3.6 and enhance connection limit handling

• Bump version of proxer-cli in Cargo.toml and Cargo.lock from 0.3.5 to 0.3.6.
• Refactor connection limit handling in src/server/mod.rs to improve logging and error handling when setting the maximum open connection limit.

Full Changelog: v0.3.5...v0.3.6