Remove unused dependency

Due to a cargo bug, this was causing issues with adding rusqlite to ZQ2. See launchbadge/sqlx#3211 - Cargo would detect a spurious version conflict in the sqlite version to bundle.
However sqlx appears completely unused in zqutils so removing the dependency entirely is an easy fix.

zqutils/Cargo.toml

@@ -36,8 +36,6 @@ semver = "1.0.21"
 serde = { version = "1.0.192", features = ["derive"] }
 serde_json = "1.0.108"
 serde_yaml = "0.9.27"
-sqlx = "0.7.3"
-sqlx-postgres = "0.7.3"
 sysctl = "0.5.5"
 sysinfo = "0.30.5"
 tokio = { version = "1.32.0", features = ["full"] }