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Polkadot version 0.9.5 has been released with HIGH priority. All Polkadot and Kusama validators should upgrade ASAP. https://github.com/paritytech/polkadot/releases/tag/v0.9.5
These and related values are modifiable by governance(via the staking.update_staking_limits extrinsic), and developers are working on safely allowing more nominators to participate in the staking process. https://github.com/paritytech/substrate/blob/d03a91a181d0b22d00a6b9ba2a8007dc254779e3/frame/staking/src/lib.rs#L2256
It's not part of the current Polkadot runtime, so you won't see the minimum stake at this point. You could calculate it out approximately what it will be by e.g. running https://github.com/w3f/validator-stats, parsing out all nominator amounts, sorting, and looking for spot #20_000.