Bump CI test timeout from 60s to 120s

Test suite was at 55s on the last passing run — adding new tests
pushed it past the 60s limit on both Ubuntu and macOS runners.

Author: teovl

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
           go build ./cmd/gateway
 
       - name: Test
-        run: go test -parallel 4 -count=1 -timeout 60s ./tests/ ./pkg/beacon/
+        run: go test -parallel 4 -count=1 -timeout 120s ./tests/ ./pkg/beacon/
 
       - name: Coverage
         if: matrix.os == 'ubuntu-latest'