chore: release v0.20.0

[github-actions]

🤖 New release

• differential-dataflow: 0.19.1 -> 0.20.0 (⚠ API breaking changes)
• differential-dogs3: 0.19.1 -> 0.20.0 (✓ API compatible changes)

⚠ differential-dataflow breaking changes

--- failure trait_missing: pub trait removed or renamed ---

Description:
A publicly-visible trait cannot be imported by its prior path. A `pub use` may have been removed, or the trait itself may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.46.0/src/lints/trait_missing.ron

Failed in:
  trait differential_dataflow::operators::reduce::ReduceCore, previously in file /tmp/.tmpyYjdDe/differential-dataflow/src/operators/reduce.rs:219
  trait differential_dataflow::operators::reduce::Reduce, previously in file /tmp/.tmpyYjdDe/differential-dataflow/src/operators/reduce.rs:31
  trait differential_dataflow::operators::Reduce, previously in file /tmp/.tmpyYjdDe/differential-dataflow/src/operators/reduce.rs:31
  trait differential_dataflow::operators::reduce::Threshold, previously in file /tmp/.tmpyYjdDe/differential-dataflow/src/operators/reduce.rs:97
  trait differential_dataflow::operators::Threshold, previously in file /tmp/.tmpyYjdDe/differential-dataflow/src/operators/reduce.rs:97
  trait differential_dataflow::operators::reduce::Count, previously in file /tmp/.tmpyYjdDe/differential-dataflow/src/operators/reduce.rs:172
  trait differential_dataflow::operators::Count, previously in file /tmp/.tmpyYjdDe/differential-dataflow/src/operators/reduce.rs:172

Changelog

differential-dataflow

0.20.0 - 2026-02-08

Other

• Deprioritize the Vec container (#664)

differential-dogs3

0.20.0 - 2026-02-08

Other

• Deprioritize the Vec container (#664)

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This PR was generated with release-plz.