feat: update version

SpringMT · SpringMT · commit 5395b0176d4c · 2024-04-02T00:45:10.000+09:00
diff --git a/lib/zstd-ruby/version.rb b/lib/zstd-ruby/version.rb
@@ -1,3 +1,3 @@
 module Zstd
-  VERSION = "1.5.6.0"
+  VERSION = "1.5.6.1"
 end
