deps: update libxml2 from 2.14.5 to 2.14.6

[tyson-redpanda]

FIXES=CORE-15341

vtools dependencies updated separately, see Jira for PR.

Backports Required

• none - not a bug fix
• none - this is a backport
• none - issue does not exist in previous branches
• none - papercut/not impactful enough to backport
• v25.3.x
• v25.2.x
• v25.1.x

Release Notes

Improvements

• Upgrade libxml2 to latest minor version

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

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[vbotbuildovich]

/backport v25.3.x

[vbotbuildovich]

/backport v25.2.x

[vbotbuildovich]

/backport v25.1.x

[vbotbuildovich]

Failed to create a backport PR to v25.3.x branch. I tried:

git remote add upstream https://github.com/redpanda-data/redpanda.git
git fetch --all
git checkout -b backport-pr-29423-v25.3.x-348 remotes/upstream/v25.3.x
git cherry-pick -x 0a4c77e486 fca8273d34 e92dc95229

Workflow run logs.

[vbotbuildovich]

Failed to create a backport PR to v25.1.x branch. I tried:

git remote add upstream https://github.com/redpanda-data/redpanda.git
git fetch --all
git checkout -b backport-pr-29423-v25.1.x-86 remotes/upstream/v25.1.x
git cherry-pick -x 0a4c77e486 fca8273d34 e92dc95229

Workflow run logs.

[vbotbuildovich]

Failed to create a backport PR to v25.2.x branch. I tried:

git remote add upstream https://github.com/redpanda-data/redpanda.git
git fetch --all
git checkout -b backport-pr-29423-v25.2.x-388 remotes/upstream/v25.2.x
git cherry-pick -x 0a4c77e486 fca8273d34 e92dc95229

Workflow run logs.