FrameLocalsProxy does not support `.update(iterable)`

[limwz01]

Bug report

Bug description:

import inspect
def main():
    ls = inspect.currentframe().f_locals
    ls.update([("a", 0)])
main()

The above works in Python 3.12 but fails in Python 3.13 with:

TypeError: update() argument must be dict or another FrameLocalsProxy

CPython versions tested on:

3.13

Operating systems tested on:

Linux

[gaogaotiantian]

I guess we can avoid duplicating code by creating a dict from the update args first and merge. We never cared too much about the performance of FrameLocalsProxy. I'll work on this.