v2.0: Bump platform tools version (backport of #2745)

[mergify]

Problem

Platform tools v1.42 is dated and still brings Rust 1.75.

Summary of Changes

Bump the tools version to v1.43, which brings Rust 1.79.

---

This is an automatic backport of pull request #2745 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of ad6002f has failed:

On branch mergify/bp/v2.0/pr-2745
Your branch is up to date with 'origin/v2.0'.

You are currently cherry-picking commit ad6002f90b.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   programs/sbf/rust/ro_modify/src/lib.rs
	modified:   sdk/cargo-build-sbf/src/main.rs
	modified:   sdk/sbf/scripts/install.sh

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   sdk/program/Cargo.toml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[LucasSte]

The reason I'm back porting this change is to bring a newer version of Rust to developers. We currently ship Rust 1.75, released in December 2023 (8 months old). This PR bumps the version to 1.79, released in June 2024.

[LucasSte]

Closing this PR as Agave v2.0 is locked on Rust 1.78. Bumping the platform tools to Rust 1.79 while the rest of the validator is behind may bring unintended problems.