chore: change further solvers in harnesses used with Kani (#2284)

CaDiCaL version 1.9.2 and later have a substantially worse performance on some
instances produced by CBMC (via Kani). Use MiniSat to change overall
verification time from over 800 seconds down to 20 (`rx_message_test`) and from
over 80 seconds down to 15 (`round_trip`).

quic/s2n-quic-core/src/packet/number/tests.rs

@@ -10,7 +10,7 @@ use bolero::{check, generator::*};
 use s2n_codec::{testing::encode, DecoderBuffer};
 
 #[test]
-#[cfg_attr(kani, kani::proof, kani::unwind(5), kani::solver(cadical))]
+#[cfg_attr(kani, kani::proof, kani::unwind(5), kani::solver(minisat))]
 fn round_trip() {
     check!()
         .with_generator(

quic/s2n-quic-platform/src/message.rs

@@ -160,7 +160,7 @@ mod tests {
     use bolero::check;
 
     #[test]
-    #[cfg_attr(kani, kani::proof, kani::unwind(17), kani::solver(cadical))]
+    #[cfg_attr(kani, kani::proof, kani::unwind(17), kani::solver(minisat))]
     fn rx_message_test() {
         let path = bolero::gen::<path::RemoteAddress>();
         let ecn = bolero::gen();