dedups gossip addresses, taking the one with highest weight (backport #29421)

[mergify]

This is an automatic backport of pull request #29421 done by Mergify.
Cherry-pick of e532316 has failed:

On branch mergify/bp/v1.14/pr-29421
Your branch is up to date with 'origin/v1.14'.

You are currently cherry-picking commit e5323166b.
  (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/contact_info.rs
	modified:   gossip/src/crds_gossip.rs
	modified:   gossip/src/crds_value.rs

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