ci: remove useless keygen

this was needed when keys weren't generated in the tests themselves

.github/workflows/tests.yaml

@@ -17,19 +17,6 @@ jobs:
         with:
           submodules: recursive
 
-      - name: Checkout zbc-fhe-tool
-        uses: actions/checkout@v3
-        with:
-          repository: zama-ai/fhevm-tfhe-cli
-          ref: main
-          path: zbc-fhe-tool
-
-      - name: Generate TFHE-rs keys
-        working-directory: ./zbc-fhe-tool
-        run: |
-          mkdir -p $HOME/.evmosd/zama/keys/network-fhe-keys
-          cargo run --features tfhe/x86_64-unix --release -- generate-keys -d $HOME/.evmosd/zama/keys/network-fhe-keys
-
       - name: Run tests
         run: make test