Bump bytecount from 0.6.3 to 0.6.4 (#2794)

Bumps [bytecount](https://github.com/llogiq/bytecount) from 0.6.3 to
0.6.4.
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src/core/Cargo.toml

@@ -25,7 +25,7 @@ maturin = []
 
 [dependencies]
 az = "1.0.0"
-bytecount = "0.6.0"
+bytecount = "0.6.4"
 byteorder = "1.4.3"
 cfg-if = "1.0"
 counter = "0.5.7"