[MINOR] Fix out-of-default-directory build

### What changes were proposed in this pull request?
Fixing a test assertion to deal with out of source tree builds.

### Why are the changes needed?
Release and CI

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
Existing tests

Closes #146 from grundprinzip/rc-build-2.

Authored-by: Martin Grund <martin.grund@databricks.com>
Signed-off-by: Martin Grund <martin.grund@databricks.com>
diff --git a/spark/sparkerrors/errors_test.go b/spark/sparkerrors/errors_test.go
index 0e867aa..f519cc4 100644
--- a/spark/sparkerrors/errors_test.go
+++ b/spark/sparkerrors/errors_test.go
@@ -54,7 +54,7 @@
 	err := WithType(assert.AnError, ConnectionError)
 	errorString := fmt.Sprintf("%+v", err)
 	t.Log(errorString)
-	assert.Contains(t, errorString, "spark-connect-go/spark/sparkerrors/errors_test.go")
+	assert.Contains(t, errorString, "spark/sparkerrors/errors_test.go")
 }
 
 func TestErrorDetailsExtractionFromGRPCStatus(t *testing.T) {