chore: pin frontend lib special exams version (openedx#1088)

Author: alangsto

package-lock.json

@@ -32,7 +32,7 @@
     "@edx/brand": "npm:@edx/[email protected]",
     "@edx/frontend-component-footer": "11.6.3",
     "@edx/frontend-component-header": "3.6.4",
-    "@edx/frontend-lib-special-exams": "2.4.0",
+    "@edx/frontend-lib-special-exams": "~2.4.0",
     "@edx/frontend-platform": "3.4.1",
     "@edx/paragon": "20.28.4",
     "@fortawesome/fontawesome-svg-core": "1.3.0",