ci: add legacy-peer-deps to bankrun tests install

Updated .github/workflows/build.yml to use `npm install --legacy-peer-deps` in the bankrun tests step.
This was missed in the previous fix and caused the CI to fail again with the same peer dependency error.

Co-authored-by: ethan-hurst <23321960+ethan-hurst@users.noreply.github.com>

Author: google-labs-jules[bot]

.github/workflows/build.yml

@@ -38,7 +38,7 @@ jobs:
       - name: Run Bankrun Tests (Program)
         run: |
           cd tests/bankrun
-          npm install
+          npm install --legacy-peer-deps
           npm test
 
       - name: Run Verifiable Build