Update module github.com/DataDog/zstd to v1.5.5

This MR contains the following updates:

Package	Type	Update	Change
github.com/DataDog/zstd	require	patch	v1.5.3-0.20220606203749-fd035e54e312 -> v1.5.5

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go.mod

@@ -3,7 +3,7 @@ module git.autistici.org/ai3/tools/replds2
 go 1.19
 
 require (
-	github.com/DataDog/zstd v1.5.3-0.20220606203749-fd035e54e312
+	github.com/DataDog/zstd v1.5.5
 	github.com/armon/go-radix v1.0.0
 	github.com/golang/protobuf v1.5.3
 	github.com/google/go-cmp v0.5.9