releaser: Bump versions for release of 0.56.2

[ci skip]

common/hugo/version_current.go

@@ -16,7 +16,7 @@ package hugo
 // CurrentVersion represents the current build version.
 // This should be the only one.
 var CurrentVersion = Version{
-	Number:     0.57,
-	PatchLevel: 0,
-	Suffix:     "-DEV",
+	Number:     0.56,
+	PatchLevel: 2,
+	Suffix:     "",
 }