Online DDL flow CI: Update golang version to 1.22.4

[shlomi-noach]

Description

Both #16017 and #16062 merged at about the same time, leading to the Online DDL flow CI test to merge with go 1.22.3 while all the rest of workflows are 1.22.4.

This updates the go version for that CI workflow.

Related Issue(s)

• CI upgrade/downgrade tests for Online DDL / throttler / vreplication flow #16017
• [main] Upgrade the Golang version to go1.22.4 #16062

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
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• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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