msrv: update to 1.51

Author: poliorcetics

Diff for: .github/workflows/main.yml

@@ -229,7 +229,7 @@ jobs:
       with:
         submodules: true
     - name: Install Rust
-      run: rustup update 1.42.0 && rustup default 1.42.0
+      run: rustup update 1.51.0 && rustup default 1.51.0
     - run: cargo build
 
   miri: