uses tikv_jemallocator::Jemalloc as the global allocator (backport #20149)

[mergify]

This is an automatic backport of pull request #20149 done by Mergify.
Cherry-pick of 2cf081d has failed:

On branch mergify/bp/v1.7/pr-20149
Your branch is up to date with 'origin/v1.7'.

You are currently cherry-picking commit 2cf081d86.
  (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:   validator/Cargo.toml
	modified:   validator/src/main.rs

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

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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[mergify]

automerge label removed due to a CI failure

[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #20166 (38ae37a) into v1.7 (49a6acf) will increase coverage by 0.0%.
The diff coverage is 0.0%.

@@           Coverage Diff           @@
##             v1.7   #20166   +/-   ##
=======================================
  Coverage    82.2%    82.2%           
=======================================
  Files         440      440           
  Lines      125134   125157   +23     
=======================================
+ Hits       102896   102948   +52     
+ Misses      22238    22209   -29