AC: pin imagecodecs for python3.6 (#2518)

Author: eaidova

tools/accuracy_checker/requirements.in

@@ -5,7 +5,9 @@ tqdm>=4.54.1
 # scikit-image version will be changed to 0.18 after fixing tests (compare_ssim method has been removed in this version)
 # note: python 3.6 wheels is not available since 0.18
 scikit-image~=0.17.2
-imagecodecs
+# there is issue with resolving versions for python3.6, pin to specific version of lib
+imagecodecs~=2020.5.30;python_version<"3.7"
+imagecodecs;python_version>="3.7"
 
 # reid
 scikit-learn>=0.24.1