chore(cargo-near): release v0.20.0

[nearprotocol-ci]

🤖 New release

• cargo-near: 0.19.2 -> 0.20.0 (⚠ API breaking changes)

⚠ cargo-near breaking changes

--- failure enum_variant_added: enum variant added on exhaustive enum ---

Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/enum_variant_added.ron

Failed in:
  variant CliNearCommand:SelfUpdate in /tmp/.tmpLE8Ydj/cargo-near/cargo-near/src/commands/mod.rs:10
  variant NearCommandDiscriminants:SelfUpdate in /tmp/.tmpLE8Ydj/cargo-near/cargo-near/src/commands/mod.rs:46
  variant NearCommandDiscriminants:SelfUpdate in /tmp/.tmpLE8Ydj/cargo-near/cargo-near/src/commands/mod.rs:46

Changelog

0.20.0 - 2026-02-28

Added

• added self update (#402)

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