build(deps): bump Externals/sse2neon from `efcbd51` to `246cf48`

Created by: dependabot[bot]

Bumps Externals/sse2neon from efcbd51 to 246cf48.

Commits

• 246cf48 Mention sse2msa
• dc4fb61 Mention IResearch as a new adoption case
• dffa3f8 feat: Implement _mm_stream_si64 (#398)
• f7b4ad5 Add parentheses around imm in some macros (#501)
• ae61222 Trivial format tweaks
• 1df9e53 Mention Olive as a new adoption case
• 35b09c2 Add AWS Graviton documentation for reference
• 2caa817 Merge pull request #500 from nlacey/add_mm_empty
• 3c9502b add mm_emtpy
• c7db945 Merge pull request #499 from HowJMay/fix-roundings-types-warning
• Additional commits viewable in compare view

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