Bump github.com/DataDog/zstd to v1.5.6 (#205)

Bump github.com/DataDog/zstd to v1.5.6.

Signed-off-by: David Enyeart <enyeart@us.ibm.com>

go.mod

@@ -46,7 +46,7 @@ require (
 require (
 	cloud.google.com/go/compute v1.25.1 // indirect
 	cloud.google.com/go/compute/metadata v0.2.3 // indirect
-	github.com/DataDog/zstd v1.4.5 // indirect
+	github.com/DataDog/zstd v1.5.6 // indirect
 	github.com/IBM/idemix/bccsp/schemes/aries v0.0.0-20231003085036-c4470b87b2d6 // indirect
 	github.com/IBM/idemix/bccsp/schemes/weak-bb v0.0.0-20240612072411-114d281b442d // indirect
 	github.com/IBM/idemix/bccsp/types v0.0.0-20240612072411-114d281b442d // indirect

go.sum

@@ -37,8 +37,8 @@ github.com/Azure/go-autorest/logger v0.2.0/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZ
 github.com/Azure/go-autorest/tracing v0.6.0/go.mod h1:+vhtPC754Xsa23ID7GlGsrdKBpUA79WCAKPPZVC2DeU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/DataDog/zstd v1.4.5 h1:EndNeuB0l9syBZhut0wns3gV1hL8zX8LIu6ZiVHWLIQ=
-github.com/DataDog/zstd v1.4.5/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
+github.com/DataDog/zstd v1.5.6 h1:LbEglqepa/ipmmQJUDnSsfvA8e8IStVcGaFWDuxvGOY=
+github.com/DataDog/zstd v1.5.6/go.mod h1:g4AWEaM3yOg3HYfnJ3YIawPnVdXJh9QME85blwSAmyw=
 github.com/GeertJohan/go.incremental v1.0.0/go.mod h1:6fAjUhbVuX1KcMD3c8TEgVUqmo4seqhv0i0kdATSkM0=
 github.com/GeertJohan/go.rice v1.0.0/go.mod h1:eH6gbSOAUv07dQuZVnBmoDP8mgsM1rtixis4Tib9if0=
 github.com/IBM/idemix v0.0.2-0.20231011101252-a4feda90f3f7 h1:ybW6FaLCYGEF03XaR+WJP7bq7XqeBI4Pfj8uKipQT+A=