chore(main): release datastore 1.20.0

[release-please[bot]]

:robot: I have created a release beep boop

1.20.0 (2024-10-18)

Features

• datastore: Add FindNearest API to the stable branch (#10980) (f0b05e2)
• datastore: Support for field update operators in the Datastore API and resolution strategies when there is a conflict at write time (78d8513)

Bug Fixes

• datastore: Bump dependencies (2ddeb15)
• datastore: Do not delay on final transaction attempt (#10824) (0d732cc)
• datastore: Remove namespace from Key.String() (40229e6)
• datastore: Remove namespace from Key.String() (#10684) (#10823) (40229e6)

---

This PR was generated with Release Please. See documentation.