Bumps solana_rbpf to version v0.2.20 (backport #22164)

[mergify]

This is an automatic backport of pull request #22164 done by Mergify.
Cherry-pick of 8a43e2d has failed:

On branch mergify/bp/v1.9/pr-22164
Your branch is up to date with 'origin/v1.9'.

You are currently cherry-picking commit 8a43e2d88.
  (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:   Cargo.lock
	modified:   programs/bpf/Cargo.lock

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   cli/Cargo.toml
	both modified:   programs/bpf/Cargo.toml
	both modified:   programs/bpf_loader/Cargo.toml
	both modified:   rbpf-cli/Cargo.toml

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

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[codecov]

Codecov Report

Merging #22207 (22e32a8) into v1.9 (c6ab915) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             v1.9   #22207   +/-   ##
=======================================
  Coverage    81.1%    81.1%           
=======================================
  Files         518      518           
  Lines      144814   144814           
=======================================
  Hits       117456   117456           
  Misses      27358    27358           

[github-actions]

This PR has been automatically locked since there has not been any activity in past 14 days after it was merged.