Release v2.10.9

• Create webp using Pillow instead of ffmpeg to avoid "invalid frame duration" error in iOS WhatsApp (#205)
• Fix uploading telegram stickers pack with >50 stickers (#230)
• Show success ratio in summary (#229)
• Fix downloading Kakao animated and static stickers (#237)
• Limit async downloading to avoid error
• Get Kakao sticker author when downloading with share link
• Fix download testing
• Downgrade Pillow to 10.4.0 to fix error when making GIF (python-pillow/Pillow#8493)
• Update dependencies

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Please use the stickers with your friends only. It is illegal and immoral to sell stickers downloaded from this program.

尊重知识产权，做个文明人，请不要转售贴图！假冒我还算了，大批下载贴图去图利真没人性。不要问为何老外总是鄙视中国人，面子是别人给的，脸是自己丢的！