Bump deps/zstd from `8689633` to `2acf904`

[dependabot[bot]]

Bumps deps/zstd from 8689633 to 2acf904.

Commits

• 2acf904 minor:doc: specify decompression behavior in presence of multiple concatenate...
• be6a182 Unit test for external sequence producer + static CCtx + streaming (#4063)
• f70fb7c Merge pull request #4046 from josepho0918/iar
• c5862f7 Merge pull request #4054 from jbajic/fix-missing-newline
• 5e9a6c2 Refactor dictionary matchfinder index safety check (#4039)
• 4c6a519 [fix] Add newline when file exceeds 128KB
• 0e2ceb2 Merge pull request #4050 from Adenilson/fix_legacy_nullptr01
• 1872688 [fix] Add check on failed allocation in legacy/zstd_v06
• 5fadd8e revert FSE_readNCount_body attribute
• 2955d92 Improve support for IAR compiler with attributes and intrinsics
• Additional commits viewable in compare view

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