Set parallelism to 1 for Go tests in CI workflow.

This change modifies the test command in the CI pipeline to run with `-p 1`, ensuring tests are executed serially. This adjustment prevents potential issues caused by parallel test execution in certain cases.

Author: buraksezer

.github/workflows/ci.yml

@@ -52,4 +52,4 @@ jobs:
         go mod download
 
     - name: Run tests
-      run: go test ./...
+      run: go test -p 1 ./...