chore: bump MSRV to 1.85 and update outdated dependencies

Align rust-version with workspace MSRV (1.85) and bump outdated
dependencies to match the core proxy versions.

Author: raffaelschneider

Cargo.toml

@@ -2,7 +2,7 @@
 name = "zentinel-agent-modsec"
 version = "0.2.0"
 edition = "2021"
-rust-version = "1.75"
+rust-version = "1.85"
 authors = ["Zentinel Contributors"]
 license = "Apache-2.0"
 repository = "https://github.com/zentinelproxy/zentinel-agent-modsec"