fix: bump ckb-types to minor version 1.2.0

[Copilot]

What problem does this PR solve?

ckb-types was released as 1.1.1 (patch), but PR #5023 added a new public method OutPointError::out_point() — a backward-compatible API addition that requires a minor version bump per semver.

What is changed and how it works?

• util/types/Cargo.toml: 1.1.1 → 1.2.0
• util/types/CHANGELOG.md: Updated release header; reclassified entry from Fixed → Added
• Cargo.lock: Updated ckb-types version accordingly

The new public API that warrants the minor bump:

impl OutPointError {
    /// Attempt to retrieve the out_point from the error.
    pub fn out_point(&self) -> Option<&OutPoint> { ... }
}

All other crates in this release (ckb-constant, ckb-app-config, ckb-network, ckb-tx-pool, ckb-chain, ckb-rpc) have appropriate patch bumps — their changes are internal, value-only constant updates, dependency upgrades with no public API surface changes, or test-only modifications.

Related changes

• PR to update owner/repo:
• Need to cherry-pick to the release branch

Check List

Tests

• No code

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