Update dependency rexml to v3.3.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rexml (changelog)	3.3.7 -> 3.3.8

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Release Notes

ruby/rexml (rexml)

v3.3.8: REXML 3.3.8 - 2024-09-29

Compare Source

Improvements

• SAX2: Improve parse performance.
  • GH-207
  • Patch by NAITOH Jun.

Fixes

• Fixed a bug that unexpected attribute namespace conflict error for
  the predefined "xml" namespace is reported.
  • GH-208
  • Patch by KITAITI Makoto

Thanks

• NAITOH Jun

• KITAITI Makoto

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