Pin ar_archive_writer to 0.4.2 to fix build on Rust 1.85

ar_archive_writer v0.5.1 uses let-chains which require Rust 1.87+.
Since the rust_suite Cargo.lock is not tracked, CI resolves to the
latest version which breaks the build.

Author: penberg

libsql-sqlite3/test/rust_suite/Cargo.toml

@@ -18,6 +18,9 @@ rustc-hash = "1"
 home = { version = "=0.5.9" }
 which = "=4.4.0"
 
+[dev-dependencies.ar_archive_writer]
+version = "=0.4.2"
+
 [features]
 default = []
 udf = []