chore: lock test util to version 2.0.0

Author: leangseu-edx

package-lock.json

@@ -37,7 +37,7 @@
     "@edx/frontend-lib-special-exams": "^3.0.1",
     "@edx/frontend-platform": "^7.1.2",
     "@edx/openedx-atlas": "^0.6.0",
-    "@edx/react-unit-test-utils": "^2.0.0",
+    "@edx/react-unit-test-utils": "2.0.0",
     "@fortawesome/fontawesome-svg-core": "1.3.0",
     "@fortawesome/free-brands-svg-icons": "5.15.4",
     "@fortawesome/free-regular-svg-icons": "5.15.4",