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

deltachat-contact-tools/Cargo.toml

@@ -9,7 +9,6 @@ license = "MPL-2.0"
 
 [dependencies]
 anyhow = { workspace = true }
-once_cell = { workspace = true }
 regex = { workspace = true }
 rusqlite = { workspace = true } # Needed in order to `impl rusqlite::types::ToSql for EmailAddress`. Could easily be put behind a feature.
 chrono = { workspace = true, features = ["alloc", "clock", "std"] }