Add edx-proctoring=3.8.2 to edx-platform constraint file to prevent others...

Add edx-proctoring=3.8.2 to edx-platform constraint file to prevent others from upgrading it to 3.8.3 accidentally (#27249)

requirements/constraints.txt

@@ -33,6 +33,9 @@ django-storages<1.9
 # for them.
 edx-enterprise==3.21.0
 
+# edx-proctoring 3.8.3 resulted in 500 error on StudentOnboardingStatusView. Temporarily pinned to 3.8.2 version
+edx-proctoring==3.8.2
+
 # Upgrading to 2.12.0 breaks several test classes due to API changes, need to update our code accordingly
 factory-boy==2.8.1