Describe the bug
Trailing commas inside indexing square brackets are not removed when running Black with -C. This also affects generic types with multiple parameters.

To Reproduce

For example, take this code:

x = [0, 1,]
x = z[0, 1,]

and run with -C. We get

x = [0, 1]
x = z[0, 1,]

Expected behavior

The final trailing comma should disappear.

x = z[0, 1]

Environment

• Black's version: 22.6.0. Also tested on main on the playground, and with/without --preview.
• OS and Python version: Linux/Python 3.10.5