Adding upstream version 0.8.9.

Signed-off-by: Daniel Baumann <daniel@debian.org>

pkg/util/jsonclient/interface.go

@@ -0,0 +1,10 @@
+package jsonclient
+
+import "net/http"
+
+type Client interface {
+	Get(url string, response any) error
+	Post(url string, request any, response any) error
+	Headers() http.Header
+	ErrorResponse(err error, response any) bool
+}