roachtest: maybe deflake change-replicas/mixed-version

[erikgrinaker]

Touches #98429.

Epic: none
Release note: None

[cockroach-teamcity]

This change is 

[smg260]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @srosenberg)

[erikgrinaker]

bors r+

[craig]

Build failed (retrying...):

• Bazel Essential CI (Cockroach)

[craig]

Build succeeded:

• Bazel Essential CI (Cockroach)

[erikgrinaker]

blathers backport 22.2

[blathers-crl]

Encountered an error creating backports. Some common things that can go wrong:

1. The backport branch might have already existed.
2. There was a merge conflict.
3. The backport branch contained merge commits.

You might need to create your backport manually using the backport tool.

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error creating merge commit from a8c161c to blathers/backport-release-22.2-98491: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 409 Merge conflict []

you may need to manually resolve merge conflicts with the backport tool.

Backport to branch 22.2 failed. See errors above.

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