Update dependency rexml to v3.4.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
rexml (changelog)	3.4.2 -> 3.4.3

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Release Notes

ruby/rexml (rexml)

v3.4.3: REXML 3.4.3 - 2025-09-07

Compare Source

Improvement

• Reject no root element XML as an invalid XML
  • GH-289
  • GH-291
  • Patch by NAITOH Jun
  • Reported by Sutou Kouhei

Fixes

• Fixed an issue with IOSource#read_until when reaching the end of a file
  • GH-287
  • GH-288
  • Patch by NAITOH Jun
  • Reported by Jason Thomas

Thanks

• NAITOH Jun

• Sutou Kouhei

• Jason Thomas

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