Reverted addition of pillow package

Initially, AWS mentioned it as a SUPPRESSED status vulnerability with HIGH severity. Hence I added it.

However, we don't really use pillow in public-dash viz_scripts and now can observe that the pillow vulnerability status has been changed to CLOSED.

viz_scripts/docker/environment36.dashboard.additions.yml

@@ -6,6 +6,4 @@ dependencies:
 - seaborn=0.11.1
 - pip:
   - nbparameterise==0.6
-  - devcron==0.4
-  - pillow==10.3.0
-
+  - devcron==0.4