v0.21.0

backhand

• Use zlib-rs as the default implementation for flate2, added feature gzip-zlib-ng to access previous behavior (#697)
• Remove gzip-zune-inflate, as this had minimal usage (#697)
• Bump MSRV to 1.81 (#693)
• Add lz4 compression and decompression, thanks @jeromegn! (#701)