Update Windows shard RAM & CPU values (#46846)
Update Windows shard RAM & CPU values (#46846)

In #45392, the Windows shard values were bumped up to 4 CPU
and 12GB RAM across the board to make tests pass. This change
gives each shard values that make sense for that shard, thus
allowing shards to run faster while conserving resources where
possible.
cbracken/flutter,cbracken/flutter,Hixie/flutter,cbracken/flutter,Hixie/flutter,cbracken/flutter,flutter/flutter,flutter/flutter,Hixie/flutter,Hixie/flutter,cbracken/flutter,flutter/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,tvolkert/flutter,Hixie/flutter,tvolkert/flutter,flutter/flutter,Hixie/flutter,Hixie/flutter,flutter/flutter,tvolkert/flutter,cbracken/flutter,flutter/flutter,tvolkert/flutter,flutter/flutter,cbracken/flutter,tvolkert/flutter,flutter/flutter,tvolkert/flutter,cbracken/flutter,tvolkert/flutter,Hixie/flutter,tvolkert/flutter,cbracken/flutter,flutter/flutter,cbracken/flutter,Hixie/flutter,Hixie/flutter