chore: bump version to v0.1.9-rc2

[edgarriba]

This pull request includes updates to the Cargo.toml files and a script correction to ensure consistency and correct functionality across the project. The most important changes include updating the version numbers for multiple dependencies and correcting a typo in the release script.

Updates to Cargo.toml files:

• Updated category for the kornia package to "science::robotics" in Cargo.toml.
• Updated version numbers for multiple dependencies from "0.1.9-rc.1" to "0.1.9-rc.2" in Cargo.toml and kornia-py/Cargo.toml. [1] [2]

Script correction:

• Fixed a typo in the scripts/release_rust.sh script to ensure the correct variable $DRY_RUN is used.