chore(deps): update rust crate oxc_sourcemap to v6.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
oxc_sourcemap	workspace.dependencies	minor	6.0.2 → 6.1.0

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Release Notes

oxc-project/oxc-sourcemap (oxc_sourcemap)

v6.1.0

Compare Source

Added

• omit sourcesContent if all of the values are null (#​287)

Fixed

• encode sourcesContent null as raw null instead of quoted string (#​291)

Other

• avoid temporary Vec in ConcatSourceMapBuilder::add_sourcemap (#​290)
• combine source_contents scans in encode_to_string (#​289)
• avoid double Arc allocation in add_source_and_content (#​288)
• apply cargo shear --fix (#​285)

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