Bump Kani version to 0.28.0 (#36)

Author: zhassan-aws

action.yml

@@ -36,7 +36,7 @@ runs:
     - name: Install Kani
       shell: bash
       run: |
-        export KANI_VERSION="0.27.0";
+        export KANI_VERSION="0.28.0";
         cargo install --version $KANI_VERSION --locked kani-verifier;
         cargo-kani setup;