removes redundant (mutable) self receivers (backport #18574)

[mergify]

This is an automatic backport of pull request #18574 done by Mergify.
Cherry-pick of 918b5c2 has failed:

On branch mergify/bp/v1.7/pr-18574
Your branch is up to date with 'origin/v1.7'.

You are currently cherry-picking commit 918b5c28b.
  (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:   gossip/src/crds_gossip.rs
	modified:   gossip/src/crds_gossip_pull.rs
	modified:   gossip/src/crds_gossip_push.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   gossip/src/cluster_info.rs

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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[solana-grimes]

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

[codecov]

Codecov Report

Merging #18580 (6feb4ea) into v1.7 (a6a302f) will decrease coverage by 0.0%.
The diff coverage is 91.8%.

@@            Coverage Diff            @@
##             v1.7   #18580     +/-   ##
=========================================
- Coverage    82.3%    82.3%   -0.1%     
=========================================
  Files         432      432             
  Lines      121713   121699     -14     
=========================================
- Hits       100217   100192     -25     
- Misses      21496    21507     +11