Fixed ResponsiveContainer ref

[mrskiro]

Until now, if user wanted to access a ref object, they had to use ref.current.current.

This was unfriendly and not clear, so I fixed it.

[KittyGiraudel]

This would be a breaking change though, so I guess it would have to wait for a major version.

[ckifer]

Added some labels, most likely fine to add this as a breaking change in 3 if we ever get there

[constgen]

Not this change is breaking. But this bug is a breaking issue.

[ckifer]

Not sure what you mean. Those that use those functionality have this referenced a certain way. If we change it in a minor or patch release it will break them.

[mrskiro]

@ckifer
Do you plan to merge these?
I recently had plans to UPGRADE my recharts and was reminded of this PR.

[ckifer]

Yeah but it's a breaking change, so not until 3.x. Which is still timeframe TBD as we gather other breaking changes

[mrskiro]

I understand.
Thanks for all the maintenance！

[ckifer]

Going to close this PR in favor of re-opening the issue #3718. Harder to keep a PR up to date while waiting for a major version