[Chore] Use Octez v20.0-rc1 binaries

Description

Problem: The new RC version of Octez binaries has been released, and we need to use these binaries in Kiln as well.

Solution: Use Octez v20.0-rc1 binaries.

Related issue(s)

None

Сhecklist

• I checked whether I should update
  • Root README.
  • Documents within docs.
• I checked whether my changes affect DB columns and tested DB migration using this doc.