feat: Update uniswap provider to use new websocket api (backport #308)

[mergify]

This is an automatic backport of pull request #308 done by Mergify.
Cherry-pick of 9ca4545 has failed:

On branch mergify/bp/umee/pr-308
Your branch is up to date with 'origin/umee'.

You are currently cherry-picking commit 9ca4545.
  (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:   .golangci.yml
	modified:   oracle/oracle.go
	modified:   oracle/provider/uniswap.go
	modified:   tests/integration/provider_test.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   ojo-provider-config/endpoints.toml
	both modified:   oracle/provider/uniswap_test.go
	both modified:   umee-provider-config/currency-pairs.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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