updated minimum supported Rust version to 1.57.0

Author: Tilen Pintarič

.github/workflows/ci.yml

@@ -82,7 +82,7 @@ jobs:
       uses: actions-rs/toolchain@v1
       with:
         profile: minimal
-        toolchain: 1.46.0
+        toolchain: 1.57.0
         override: true
 
     - name: Version features