refactor: replace once_cell::sync::Lazy with std::sync::LazyLock

Cargo.toml

@@ -72,7 +72,6 @@ mime = "0.3.17"
 num_cpus = "1.16"
 num-derive = "0.4"
 num-traits = { workspace = true }
-once_cell = { workspace = true }
 parking_lot = "0.12"
 percent-encoding = "2.3"
 pgp = { version = "0.15.0", default-features = false }
@@ -185,7 +184,6 @@ log = "0.4"
 mailparse = "0.16.1"
 nu-ansi-term = "0.46"
 num-traits = "0.2"
-once_cell = "1.21.3"
 rand = "0.8"
 regex = "1.10"
 rusqlite = "0.32"