Upgrade to Rust 1.43.0 (bp #9754)

[mergify]

This is an automated backport of pull request #9754 done by Mergify

Cherry-pick of 230df0e has failed:

On branch mergify/bp/v1.0/pr-9754
Your branch is up to date with 'origin/v1.0'.

You are currently cherry-picking commit 230df0ec0.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:

	modified:   ci/docker-rust-nightly/Dockerfile
	modified:   ci/docker-rust/Dockerfile
	modified:   ci/rust-version.sh
	modified:   ci/test-bench.sh
	modified:   logger/src/lib.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   core/src/validator.rs
	both modified:   runtime/src/accounts_db.rs

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[solana-grimes]

😱 New commits were pushed while the automerge label was present.

[codecov]

Codecov Report

Merging #9807 into v1.0 will decrease coverage by 0.0%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            v1.0   #9807     +/-   ##
=======================================
- Coverage   80.2%   80.2%   -0.1%     
=======================================
  Files        269     269             
  Lines      59499   59397    -102     
=======================================
- Hits       47752   47649    -103     
- Misses     11747   11748      +1