io fix

crates/recursion/gnark-ffi/src/plonk_bn254.rs

@@ -126,7 +126,7 @@ impl PlonkBn254Prover {
 
     /// Modify the PlonkVerifier so that it works with the SP1Verifier.
     fn modify_plonk_verifier(file_path: &Path) -> io::Result<()> {
-        let mut file = File::open(file_path)?;
+        let mut file = File::options().read(true).write(true).open(file_path)?;
         let mut content = String::new();
         file.read_to_string(&mut content)?;