core: replace all use of interface{} with any (#848)

core/pkg/ipp/cups-client.go

@@ -307,7 +307,7 @@ func (c *CUPSClient) PrintTestPage(printer string, testPageData io.Reader, size
 		Name:     "Test Page",
 		Size:     size,
 		MimeType: MimeTypePDF,
-	}, printer, map[string]interface{}{
+	}, printer, map[string]any{
 		AttributeJobName: "Test Page",
 	})
 }