Bump rexml to 3.2.6
What does this MR do and why?
This library added build support for Ruby 3.1 and 3.2 as of 3.2.6, which is just one patch level away from what we use currently.
To benefit from these patches and upstream CI, let's update this dependency.
- https://github.com/ruby/rexml/releases/tag/v3.2.6
- https://my.diffend.io/gems/rexml/3.2.5/3.2.6/page/3 (relevant changes)
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MR acceptance checklist
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Related to #422671 (closed)