Drop vector bits from allowed_unpinned_deps.yaml (flutter#8327)

Now that flutter#7941 has landed

Author: kevmoo

script/configs/allowed_unpinned_deps.yaml

@@ -6,12 +6,6 @@
 
 ## Explicit allowances
 
-# Temporary allowance to allow importing packages in parallel; remove once
-# https://github.com/flutter/packages/pull/7941 has landed.
-- vector_graphics
-- vector_graphics_codec
-- vector_graphics_compiler
-
 # Owned by individual Flutter Team members.
 # Ideally we would not do this, since there's no clear plan for what
 # would happen if the individuals left the Flutter Team, and the