chore(deps): update dependency aomediacodec/svt-av1 to v2.1.0

[renovate]

This PR contains the following updates:

Package	Update	Change
AOMediaCodec/SVT-AV1	minor	2.0.0 -> 2.1.0

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Release Notes

AOMediaCodec/SVT-AV1 (AOMediaCodec/SVT-AV1)

v2.1.0

Compare Source

API updates

• One config parameter added within the padding size. Config param structure size remains unchanged
• Presets 6 and 12 are now pointing to presets 7 and 13 respectively due to the lack of spacing between the presets
• Further preset shuffling is being discussed in #​2152

Encoder

• Added variance boost support to improve visual quality for the tune vq mode
• Improve the tradeoffs for the random access mode across presets:
• Speedup of 12-40% presets M0, M3, M5 and M6 while maintaining similar quality levels
• Improved the compression efficiency of presets M11-M13 by 1-2% (!2213)
• Added ARM optimizations for functions with c_only equivalent

Cleanup Build and bug fixes and documentation

• Use nasm as a default assembler and yasm as a fallback
• Fix performance regression for systems with multiple processor groups
• Enable building SvtAv1ApiTests and SvtAv1E2ETests for arm
• Added variance boost documentation
• Added a mailmap file to map duplicate git generated emails to the appropriate author

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